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/**
 *Submitted for verification at Etherscan.io on 2018-05-31
*/

pragma solidity ^0.4.21;

// File: zeppelin-solidity/contracts/ownership/rbac/Roles.sol

/**
 * @title Roles
 * @author Francisco Giordano (@frangio)
 * @dev Library for managing addresses assigned to a Role.
 *      See RBAC.sol for example usage.
 */
library Roles {
  struct Role {
    mapping (address => bool) bearer;
  }

  /**
   * @dev give an address access to this role
   */
  function add(Role storage role, address addr)
    internal
  {
    role.bearer[addr] = true;
  }

  /**
   * @dev remove an address' access to this role
   */
  function remove(Role storage role, address addr)
    internal
  {
    role.bearer[addr] = false;
  }

  /**
   * @dev check if an address has this role
   * // reverts
   */
  function check(Role storage role, address addr)
    view
    internal
  {
    require(has(role, addr));
  }

  /**
   * @dev check if an address has this role
   * @return bool
   */
  function has(Role storage role, address addr)
    view
    internal
    returns (bool)
  {
    return role.bearer[addr];
  }
}

// File: zeppelin-solidity/contracts/ownership/rbac/RBAC.sol

/**
 * @title RBAC (Role-Based Access Control)
 * @author Matt Condon (@Shrugs)
 * @dev Stores and provides setters and getters for roles and addresses.
 *      Supports unlimited numbers of roles and addresses.
 *      See //contracts/mocks/RBACMock.sol for an example of usage.
 * This RBAC method uses strings to key roles. It may be beneficial
 *  for you to write your own implementation of this interface using Enums or similar.
 * It's also recommended that you define constants in the contract, like ROLE_ADMIN below,
 *  to avoid typos.
 */
contract RBAC {
  using Roles for Roles.Role;

  mapping (string => Roles.Role) private roles;

  event RoleAdded(address addr, string roleName);
  event RoleRemoved(address addr, string roleName);

  /**
   * A constant role name for indicating admins.
   */
  string public constant ROLE_ADMIN = "admin";

  /**
   * @dev constructor. Sets msg.sender as admin by default
   */
  function RBAC()
    public
  {
    addRole(msg.sender, ROLE_ADMIN);
  }

  /**
   * @dev reverts if addr does not have role
   * @param addr address
   * @param roleName the name of the role
   * // reverts
   */
  function checkRole(address addr, string roleName)
    view
    public
  {
    roles[roleName].check(addr);
  }

  /**
   * @dev determine if addr has role
   * @param addr address
   * @param roleName the name of the role
   * @return bool
   */
  function hasRole(address addr, string roleName)
    view
    public
    returns (bool)
  {
    return roles[roleName].has(addr);
  }

  /**
   * @dev add a role to an address
   * @param addr address
   * @param roleName the name of the role
   */
  function adminAddRole(address addr, string roleName)
    onlyAdmin
    public
  {
    addRole(addr, roleName);
  }

  /**
   * @dev remove a role from an address
   * @param addr address
   * @param roleName the name of the role
   */
  function adminRemoveRole(address addr, string roleName)
    onlyAdmin
    public
  {
    removeRole(addr, roleName);
  }

  /**
   * @dev add a role to an address
   * @param addr address
   * @param roleName the name of the role
   */
  function addRole(address addr, string roleName)
    internal
  {
    roles[roleName].add(addr);
    RoleAdded(addr, roleName);
  }

  /**
   * @dev remove a role from an address
   * @param addr address
   * @param roleName the name of the role
   */
  function removeRole(address addr, string roleName)
    internal
  {
    roles[roleName].remove(addr);
    RoleRemoved(addr, roleName);
  }

  /**
   * @dev modifier to scope access to a single role (uses msg.sender as addr)
   * @param roleName the name of the role
   * // reverts
   */
  modifier onlyRole(string roleName)
  {
    checkRole(msg.sender, roleName);
    _;
  }

  /**
   * @dev modifier to scope access to admins
   * // reverts
   */
  modifier onlyAdmin()
  {
    checkRole(msg.sender, ROLE_ADMIN);
    _;
  }

  /**
   * @dev modifier to scope access to a set of roles (uses msg.sender as addr)
   * @param roleNames the names of the roles to scope access to
   * // reverts
   *
   * @TODO - when solidity supports dynamic arrays as arguments to modifiers, provide this
   *  see: https://github.com/ethereum/solidity/issues/2467
   */
  // modifier onlyRoles(string[] roleNames) {
  //     bool hasAnyRole = false;
  //     for (uint8 i = 0; i < roleNames.length; i++) {
  //         if (hasRole(msg.sender, roleNames[i])) {
  //             hasAnyRole = true;
  //             break;
  //         }
  //     }

  //     require(hasAnyRole);

  //     _;
  // }
}

// File: contracts/ButtonClickRBAC.sol

/*
 * @title Manages administrative roles for specific ethereum addresses
 */
contract ButtonClickRBAC is RBAC {

    string constant ROLE_FINANCE = "finance";

    /**
     * @dev Access modifier, which restricts functions to only the "finance" role
     */
    modifier onlyFinance() {
        checkRole(msg.sender, ROLE_FINANCE);
        _;
    }

}

// File: contracts/ButtonClickGameControls.sol

/*
 * @title Defines specific controls for game administrators
 */
contract ButtonClickGameControls is ButtonClickRBAC {

    /**
     * Monitors if the game has been started
     */
    bool public started = false;

    /**
     * In order to reduce the likelihood of someone spamming the button click continually with
     * multiple ether addresses, which would effectively prevent the button from ever decrementing, 
     * we have introduced the concept of a minimum fee required to click the button. 
     */
    uint256 public minimumFee;

    /**
     * Defines how many blocks must elapse before the game can be "won"
     *
     * http://solidity.readthedocs.io/en/develop/contracts.html?#visibility-and-getters
     */
    uint256 public requiredBlocksElapsedForVictory;

    /**
     * @dev Access modifier, which restricts a call to happen once the game is started
     */
    modifier isStarted() {
        require(started);
        _;
    }

    /**
     * @dev Changes the required number of blocks for victory. This may ONLY be called by the "admin" role
     */
    function setRequiredBlocksElapsedForVictory(uint256 _requiredBlocksElapsedForVictory) external onlyAdmin {
        requiredBlocksElapsedForVictory = _requiredBlocksElapsedForVictory;
    }
    
    /**
     * @dev Changes the minimum fee. This may ONLY be called by the "finance" role
     */
    function setMinimumFee(uint256 _minimumFee) external onlyFinance {
        minimumFee = _minimumFee;
    }

    /**
     * @dev Withdraws the available balance. This may ONLY be called by the "finance" role
     */
    function withdrawBalance() external onlyFinance {
        msg.sender.transfer(address(this).balance);
    }
    
}

// File: zeppelin-solidity/contracts/math/Math.sol

/**
 * @title Math
 * @dev Assorted math operations
 */
library Math {
  function max64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }
}

// File: zeppelin-solidity/contracts/token/ERC721/ERC721Basic.sol

/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Basic {
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
  event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);
  event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);  

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function exists(uint256 _tokenId) public view returns (bool _exists);
  
  function approve(address _to, uint256 _tokenId) public;
  function getApproved(uint256 _tokenId) public view returns (address _operator);
  
  function setApprovalForAll(address _operator, bool _approved) public;
  function isApprovedForAll(address _owner, address _operator) public view returns (bool);

  function transferFrom(address _from, address _to, uint256 _tokenId) public;
  function safeTransferFrom(address _from, address _to, uint256 _tokenId) public;  
  function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes _data) public;
}

// File: zeppelin-solidity/contracts/token/ERC721/ERC721.sol

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Enumerable is ERC721Basic {
  function totalSupply() public view returns (uint256);
  function tokenOfOwnerByIndex(address _owner, uint256 _index) public view returns (uint256 _tokenId);
  function tokenByIndex(uint256 _index) public view returns (uint256);
}

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Metadata is ERC721Basic {
  function name() public view returns (string _name);
  function symbol() public view returns (string _symbol);
  function tokenURI(uint256 _tokenId) public view returns (string);
}

/**
 * @title ERC-721 Non-Fungible Token Standard, full implementation interface
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}

// File: zeppelin-solidity/contracts/token/ERC721/DeprecatedERC721.sol

/**
 * @title ERC-721 methods shipped in OpenZeppelin v1.7.0, removed in the latest version of the standard
 * @dev Only use this interface for compatibility with previously deployed contracts
 * @dev Use ERC721 for interacting with new contracts which are standard-compliant
 */
contract DeprecatedERC721 is ERC721 {
  function takeOwnership(uint256 _tokenId) public;
  function transfer(address _to, uint256 _tokenId) public;
  function tokensOf(address _owner) public view returns (uint256[]);
}

// File: zeppelin-solidity/contracts/AddressUtils.sol

/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

  /**
   * Returns whether there is code in the target address
   * @dev This function will return false if invoked during the constructor of a contract,
   *  as the code is not actually created until after the constructor finishes.
   * @param addr address address to check
   * @return whether there is code in the target address
   */
  function isContract(address addr) internal view returns (bool) {
    uint256 size;
    assembly { size := extcodesize(addr) }
    return size > 0;
  }

}

// File: zeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

// File: zeppelin-solidity/contracts/token/ERC721/ERC721Receiver.sol

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 *  from ERC721 asset contracts.
 */
contract ERC721Receiver {
  /**
   * @dev Magic value to be returned upon successful reception of an NFT
   *  Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`,
   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
   */
  bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba; 

  /**
   * @notice Handle the receipt of an NFT
   * @dev The ERC721 smart contract calls this function on the recipient
   *  after a `safetransfer`. This function MAY throw to revert and reject the
   *  transfer. This function MUST use 50,000 gas or less. Return of other
   *  than the magic value MUST result in the transaction being reverted.
   *  Note: the contract address is always the message sender.
   * @param _from The sending address 
   * @param _tokenId The NFT identifier which is being transfered
   * @param _data Additional data with no specified format
   * @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
   */
  function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4);
}

// File: zeppelin-solidity/contracts/token/ERC721/ERC721BasicToken.sol

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721BasicToken is ERC721Basic {
  using SafeMath for uint256;
  using AddressUtils for address;
  
  // Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
  // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
  bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba; 

  // Mapping from token ID to owner
  mapping (uint256 => address) internal tokenOwner;

  // Mapping from token ID to approved address
  mapping (uint256 => address) internal tokenApprovals;

  // Mapping from owner to number of owned token
  mapping (address => uint256) internal ownedTokensCount;

  // Mapping from owner to operator approvals
  mapping (address => mapping (address => bool)) internal operatorApprovals;

  /**
  * @dev Guarantees msg.sender is owner of the given token
  * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
  */
  modifier onlyOwnerOf(uint256 _tokenId) {
    require(ownerOf(_tokenId) == msg.sender);
    _;
  }

  /**
  * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
  * @param _tokenId uint256 ID of the token to validate
  */
  modifier canTransfer(uint256 _tokenId) {
    require(isApprovedOrOwner(msg.sender, _tokenId));
    _;
  }

  /**
  * @dev Gets the balance of the specified address
  * @param _owner address to query the balance of
  * @return uint256 representing the amount owned by the passed address
  */
  function balanceOf(address _owner) public view returns (uint256) {
    require(_owner != address(0));
    return ownedTokensCount[_owner];
  }

  /**
  * @dev Gets the owner of the specified token ID
  * @param _tokenId uint256 ID of the token to query the owner of
  * @return owner address currently marked as the owner of the given token ID
  */
  function ownerOf(uint256 _tokenId) public view returns (address) {
    address owner = tokenOwner[_tokenId];
    require(owner != address(0));
    return owner;
  }

  /**
  * @dev Returns whether the specified token exists
  * @param _tokenId uint256 ID of the token to query the existance of
  * @return whether the token exists
  */
  function exists(uint256 _tokenId) public view returns (bool) {
    address owner = tokenOwner[_tokenId];
    return owner != address(0);
  }

  /**
  * @dev Approves another address to transfer the given token ID
  * @dev The zero address indicates there is no approved address.
  * @dev There can only be one approved address per token at a given time.
  * @dev Can only be called by the token owner or an approved operator.
  * @param _to address to be approved for the given token ID
  * @param _tokenId uint256 ID of the token to be approved
  */
  function approve(address _to, uint256 _tokenId) public {
    address owner = ownerOf(_tokenId);
    require(_to != owner);
    require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

    if (getApproved(_tokenId) != address(0) || _to != address(0)) {
      tokenApprovals[_tokenId] = _to;
      Approval(owner, _to, _tokenId);
    }
  }

  /**
   * @dev Gets the approved address for a token ID, or zero if no address set
   * @param _tokenId uint256 ID of the token to query the approval of
   * @return address currently approved for a the given token ID
   */
  function getApproved(uint256 _tokenId) public view returns (address) {
    return tokenApprovals[_tokenId];
  }


  /**
  * @dev Sets or unsets the approval of a given operator
  * @dev An operator is allowed to transfer all tokens of the sender on their behalf
  * @param _to operator address to set the approval
  * @param _approved representing the status of the approval to be set
  */
  function setApprovalForAll(address _to, bool _approved) public {
    require(_to != msg.sender);
    operatorApprovals[msg.sender][_to] = _approved;
    ApprovalForAll(msg.sender, _to, _approved);
  }

  /**
   * @dev Tells whether an operator is approved by a given owner
   * @param _owner owner address which you want to query the approval of
   * @param _operator operator address which you want to query the approval of
   * @return bool whether the given operator is approved by the given owner
   */
  function isApprovedForAll(address _owner, address _operator) public view returns (bool) {
    return operatorApprovals[_owner][_operator];
  }

  /**
  * @dev Transfers the ownership of a given token ID to another address
  * @dev Usage of this method is discouraged, use `safeTransferFrom` whenever possible
  * @dev Requires the msg sender to be the owner, approved, or operator
  * @param _from current owner of the token
  * @param _to address to receive the ownership of the given token ID
  * @param _tokenId uint256 ID of the token to be transferred
  */
  function transferFrom(address _from, address _to, uint256 _tokenId) public canTransfer(_tokenId) {
    require(_from != address(0));
    require(_to != address(0));

    clearApproval(_from, _tokenId);
    removeTokenFrom(_from, _tokenId);
    addTokenTo(_to, _tokenId);
    
    Transfer(_from, _to, _tokenId);
  }

  /**
  * @dev Safely transfers the ownership of a given token ID to another address
  * @dev If the target address is a contract, it must implement `onERC721Received`,
  *  which is called upon a safe transfer, and return the magic value
  *  `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise,
  *  the transfer is reverted.
  * @dev Requires the msg sender to be the owner, approved, or operator
  * @param _from current owner of the token
  * @param _to address to receive the ownership of the given token ID
  * @param _tokenId uint256 ID of the token to be transferred
  */
  function safeTransferFrom(address _from, address _to, uint256 _tokenId) public canTransfer(_tokenId) {
    safeTransferFrom(_from, _to, _tokenId, "");
  }

  /**
  * @dev Safely transfers the ownership of a given token ID to another address
  * @dev If the target address is a contract, it must implement `onERC721Received`,
  *  which is called upon a safe transfer, and return the magic value
  *  `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise,
  *  the transfer is reverted.
  * @dev Requires the msg sender to be the owner, approved, or operator
  * @param _from current owner of the token
  * @param _to address to receive the ownership of the given token ID
  * @param _tokenId uint256 ID of the token to be transferred
  * @param _data bytes data to send along with a safe transfer check
  */
  function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes _data) public canTransfer(_tokenId) {
    transferFrom(_from, _to, _tokenId);
    require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
  }

  /**
   * @dev Returns whether the given spender can transfer a given token ID
   * @param _spender address of the spender to query
   * @param _tokenId uint256 ID of the token to be transferred
   * @return bool whether the msg.sender is approved for the given token ID,
   *  is an operator of the owner, or is the owner of the token
   */
  function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) {
    address owner = ownerOf(_tokenId);
    return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender);
  }

  /**
  * @dev Internal function to mint a new token
  * @dev Reverts if the given token ID already exists
  * @param _to The address that will own the minted token
  * @param _tokenId uint256 ID of the token to be minted by the msg.sender
  */
  function _mint(address _to, uint256 _tokenId) internal {
    require(_to != address(0));
    addTokenTo(_to, _tokenId);
    Transfer(address(0), _to, _tokenId);
  }

  /**
  * @dev Internal function to burn a specific token
  * @dev Reverts if the token does not exist
  * @param _tokenId uint256 ID of the token being burned by the msg.sender
  */
  function _burn(address _owner, uint256 _tokenId) internal {
    clearApproval(_owner, _tokenId);
    removeTokenFrom(_owner, _tokenId);
    Transfer(_owner, address(0), _tokenId);
  }

  /**
  * @dev Internal function to clear current approval of a given token ID
  * @dev Reverts if the given address is not indeed the owner of the token
  * @param _owner owner of the token
  * @param _tokenId uint256 ID of the token to be transferred
  */
  function clearApproval(address _owner, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _owner);
    if (tokenApprovals[_tokenId] != address(0)) {
      tokenApprovals[_tokenId] = address(0);
      Approval(_owner, address(0), _tokenId);
    }
  }

  /**
  * @dev Internal function to add a token ID to the list of a given address
  * @param _to address representing the new owner of the given token ID
  * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
  */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    require(tokenOwner[_tokenId] == address(0));
    tokenOwner[_tokenId] = _to;
    ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
  }

  /**
  * @dev Internal function to remove a token ID from the list of a given address
  * @param _from address representing the previous owner of the given token ID
  * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
  */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _from);
    ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
    tokenOwner[_tokenId] = address(0);
  }

  /**
  * @dev Internal function to invoke `onERC721Received` on a target address
  * @dev The call is not executed if the target address is not a contract
  * @param _from address representing the previous owner of the given token ID
  * @param _to target address that will receive the tokens
  * @param _tokenId uint256 ID of the token to be transferred
  * @param _data bytes optional data to send along with the call
  * @return whether the call correctly returned the expected magic value
  */
  function checkAndCallSafeTransfer(address _from, address _to, uint256 _tokenId, bytes _data) internal returns (bool) {
    if (!_to.isContract()) {
      return true;
    }
    bytes4 retval = ERC721Receiver(_to).onERC721Received(_from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}

// File: zeppelin-solidity/contracts/token/ERC721/ERC721Token.sol

/**
 * @title Full ERC721 Token
 * This implementation includes all the required and some optional functionality of the ERC721 standard
 * Moreover, it includes approve all functionality using operator terminology
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Token is ERC721, ERC721BasicToken {
  // Token name
  string internal name_;

  // Token symbol
  string internal symbol_;

  // Mapping from owner to list of owned token IDs
  mapping (address => uint256[]) internal ownedTokens;

  // Mapping from token ID to index of the owner tokens list
  mapping(uint256 => uint256) internal ownedTokensIndex;

  // Array with all token ids, used for enumeration
  uint256[] internal allTokens;

  // Mapping from token id to position in the allTokens array
  mapping(uint256 => uint256) internal allTokensIndex;

  // Optional mapping for token URIs 
  mapping(uint256 => string) internal tokenURIs;

  /**
  * @dev Constructor function
  */
  function ERC721Token(string _name, string _symbol) public {
    name_ = _name;
    symbol_ = _symbol;
  }

  /**
  * @dev Gets the token name
  * @return string representing the token name
  */
  function name() public view returns (string) {
    return name_;
  }

  /**
  * @dev Gets the token symbol
  * @return string representing the token symbol
  */
  function symbol() public view returns (string) {
    return symbol_;
  }

  /**
  * @dev Returns an URI for a given token ID
  * @dev Throws if the token ID does not exist. May return an empty string.
  * @param _tokenId uint256 ID of the token to query
  */
  function tokenURI(uint256 _tokenId) public view returns (string) {
    require(exists(_tokenId));
    return tokenURIs[_tokenId];
  }

  /**
  * @dev Internal function to set the token URI for a given token
  * @dev Reverts if the token ID does not exist
  * @param _tokenId uint256 ID of the token to set its URI
  * @param _uri string URI to assign
  */
  function _setTokenURI(uint256 _tokenId, string _uri) internal {
    require(exists(_tokenId));
    tokenURIs[_tokenId] = _uri;
  }

  /**
  * @dev Gets the token ID at a given index of the tokens list of the requested owner
  * @param _owner address owning the tokens list to be accessed
  * @param _index uint256 representing the index to be accessed of the requested tokens list
  * @return uint256 token ID at the given index of the tokens list owned by the requested address
  */
  function tokenOfOwnerByIndex(address _owner, uint256 _index) public view returns (uint256) {
    require(_index < balanceOf(_owner));
    return ownedTokens[_owner][_index];
  }

  /**
  * @dev Gets the total amount of tokens stored by the contract
  * @return uint256 representing the total amount of tokens
  */
  function totalSupply() public view returns (uint256) {
    return allTokens.length;
  }

  /**
  * @dev Gets the token ID at a given index of all the tokens in this contract
  * @dev Reverts if the index is greater or equal to the total number of tokens
  * @param _index uint256 representing the index to be accessed of the tokens list
  * @return uint256 token ID at the given index of the tokens list
  */
  function tokenByIndex(uint256 _index) public view returns (uint256) {
    require(_index < totalSupply());
    return allTokens[_index];
  }

  /**
  * @dev Internal function to add a token ID to the list of a given address
  * @param _to address representing the new owner of the given token ID
  * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
  */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    super.addTokenTo(_to, _tokenId);
    uint256 length = ownedTokens[_to].length;
    ownedTokens[_to].push(_tokenId);
    ownedTokensIndex[_tokenId] = length;
  }

  /**
  * @dev Internal function to remove a token ID from the list of a given address
  * @param _from address representing the previous owner of the given token ID
  * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
  */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    super.removeTokenFrom(_from, _tokenId);

    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];

    ownedTokens[_from][tokenIndex] = lastToken;
    ownedTokens[_from][lastTokenIndex] = 0;
    // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
    // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
    // the lastToken to the first position, and then dropping the element placed in the last position of the list

    ownedTokens[_from].length--;
    ownedTokensIndex[_tokenId] = 0;
    ownedTokensIndex[lastToken] = tokenIndex;
  }

  /**
  * @dev Internal function to mint a new token
  * @dev Reverts if the given token ID already exists
  * @param _to address the beneficiary that will own the minted token
  * @param _tokenId uint256 ID of the token to be minted by the msg.sender
  */
  function _mint(address _to, uint256 _tokenId) internal {
    super._mint(_to, _tokenId);
    
    allTokensIndex[_tokenId] = allTokens.length;
    allTokens.push(_tokenId);
  }

  /**
  * @dev Internal function to burn a specific token
  * @dev Reverts if the token does not exist
  * @param _owner owner of the token to burn
  * @param _tokenId uint256 ID of the token being burned by the msg.sender
  */
  function _burn(address _owner, uint256 _tokenId) internal {
    super._burn(_owner, _tokenId);

    // Clear metadata (if any)
    if (bytes(tokenURIs[_tokenId]).length != 0) {
      delete tokenURIs[_tokenId];
    }

    // Reorg all tokens array
    uint256 tokenIndex = allTokensIndex[_tokenId];
    uint256 lastTokenIndex = allTokens.length.sub(1);
    uint256 lastToken = allTokens[lastTokenIndex];

    allTokens[tokenIndex] = lastToken;
    allTokens[lastTokenIndex] = 0;

    allTokens.length--;
    allTokensIndex[_tokenId] = 0;
    allTokensIndex[lastToken] = tokenIndex;
  }

}

// File: contracts/ButtonClickGame.sol

contract ButtonClickGame is ERC721Token("The Ether Button", "Butt"), ButtonClickGameControls {

    /**
     * @dev This event is fired whenever a user clicks on a button, thereby creating a click
     * and resetting our block timer
     */
    event ButtonClick(address indexed owner, uint256 tokenId);

    /**
     * Defines the main struct for button clicks, which contains all relevant metadata about
     * the click action.
     *
     * Please ensure that alterations to this struct respect the byte-packing rules:
     * http://solidity.readthedocs.io/en/develop/miscellaneous.html
     */
    struct ButtonClickMetadata {
        // Tracks how far the user was away from the desired block (0 is optimal)
        uint64 blocksAwayFromDesiredBlock;

        // Defines the "generation" of this game. This gets incremented whenever the button is clicked
        // at the desired block
        uint64 clickGeneration;

        // The timestamp from the block when this click occurred
        uint64 clickTime;
    }

    /**
     * An array which contains a complete list of of ButtonClickMetadata, each of which
     * represents a unique time in which the button was clicked. The ID of each click
     * event is an index into this array
     */
    ButtonClickMetadata[] clicks;

    /**
     * Defines the current game generation. Users can play again whenever this increments.
     * Note: This always starts with generation 1
     *
     * http://solidity.readthedocs.io/en/develop/contracts.html?#visibility-and-getters
     */
    uint256 public gameGeneration = 1;

    /**
     * Defines the block number at which a click will "win"
     *
     * http://solidity.readthedocs.io/en/develop/contracts.html?#visibility-and-getters
     */
    uint256 public blockNumberForVictory;

    /**
     * A mapping from a specific address to which generation the user last clicked the button
     * during. Regardless of whether a user transfers his/her click token, we only allow a 
     * single button click per game generation
     */
    mapping (address => uint256) public addressLastClickedForGeneration;

    /**
     * A mapping from the number "remaining blocks" (eg 19 blocks left) to the number of clicks
     * clicks that occurred at this "remaining blocks" total
     */
    mapping (uint8 => uint256) public numberOfClicksAtBlocksRemaining;

    /**
     * @dev This method contains the core game logic, tracking a distinct button "click" event and 
     * saving all relevant metadata associated with it. This method will generate both a ButtonClick 
     * and Transfer event. Callers can ONLY call this method a single time per game generation.
     *
     * @return the id in our array, which is the latest click
     */
    function clickButton() external isStarted payable returns (uint256) {
        // Avoid spamming the game with a minimum fee
        require(msg.value >= minimumFee);

        // Don't allow the game to be played indefinitely
        require(gameGeneration <= 65535);

        // Require that the user has never click the button previously this round
        require(addressLastClickedForGeneration[msg.sender] < gameGeneration);

        // Immediately bump the user's last button click to this generation
        addressLastClickedForGeneration[msg.sender] = gameGeneration;

        // Ensure that 0 is the effective floor for elapsed blocks
        // Math.max256 won't work due to integer underflow, which will give a huge number if block.number > blockNumberForVictory
        uint256 _blocksAwayFromDesiredBlock;
        if (blockNumberForVictory > block.number) {
            _blocksAwayFromDesiredBlock = blockNumberForVictory - block.number;
        } else {
            _blocksAwayFromDesiredBlock = 0;
        }

        // Keep the local value before possibly incrementing it in the victory condition
        uint256 _generation = gameGeneration;

        // Victory condition!!
        if (_blocksAwayFromDesiredBlock == 0) {
            gameGeneration++;
        }

        // Increment how many clicks have occurred at this number
        numberOfClicksAtBlocksRemaining[uint8(_blocksAwayFromDesiredBlock)] += 1;

        // Update the blockNumber that is required for the next victory condition
        blockNumberForVictory = block.number + requiredBlocksElapsedForVictory;

        // Create a new click
        ButtonClickMetadata memory _click = ButtonClickMetadata({
            blocksAwayFromDesiredBlock: uint64(_blocksAwayFromDesiredBlock),
            clickGeneration: uint64(_generation),
            clickTime: uint64(now)
        });
        uint256 newClickId = clicks.push(_click) - 1;

        // Emit the click event
        emit ButtonClick(msg.sender, newClickId);

        // Formally mint this token and transfer ownership
        _mint(msg.sender, newClickId);

        return newClickId;
    }

    /**
     * Fetches information about a specific click event
     * 
     * @param _id The ID of a specific button click token
     */
    function getClickMetadata(uint256 _id) external view returns (
        uint256 blocksAwayFromDesiredBlock,
        uint256 clickTime,
        uint256 clickGeneration,
        address owner
    ) {
        ButtonClickMetadata storage metadata = clicks[_id];

        blocksAwayFromDesiredBlock = uint256(metadata.blocksAwayFromDesiredBlock);
        clickTime = uint256(metadata.clickTime);
        clickGeneration = uint256(metadata.clickGeneration);
        owner = ownerOf(_id);
    }

}

// File: contracts/ButtonClickGameContract.sol

contract ButtonClickGameContract is ButtonClickGame {

    /**
     * Core constructer, which starts the game contact
     */
    function ButtonClickGameContract() public {
        // The contract creator immediately takes over both Admin and Finance roles
        addRole(msg.sender, ROLE_ADMIN);
        addRole(msg.sender, ROLE_FINANCE);

        minimumFee = 500000000000000; // 0.0005 ETH (hopefully low enough to not deter users, but high enough to avoid bots)
        requiredBlocksElapsedForVictory = 20; // 20 blocks must elapse to win
    }    

    /**
     * @dev Officially starts the game and configures all initial details
     */
    function startGame() external onlyAdmin {
        require(!started);
        started = true;
        blockNumberForVictory = block.number + requiredBlocksElapsedForVictory;
    }

    /**
     * @dev A simple function to allow for deposits into this contract. We use this
     * instead of the fallback function to ensure that deposits are intentional 
     */
    function sendDeposit() external payable {
        
    }

}

• No Contract Security Audit Submitted- Submit Audit Here

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