When I try to create my contract on remix using metamask (injected web3/Ropsten) I set gas limit to 4700000 in remix and press Create. When MetaMask opens it asks me to lower my gas fee under a certain amount. Once I lower it (if I don't I can't create it) the contract gets created BUT my variables inside the contract are not initialized. For example a var a = 10; is returning 0.

How can I overcome this problem?

pragma solidity ^0.4.20;
import "./oraclize.sol";

contract Casino is usingOraclize {
   address owner;
   uint public betAmount = 30 finney; //Equal to 0.01 Ether
   uint public totalBet; //Amount of Ether bet for current game
   uint public numberOfBets; //Total number of current bets
   //uint public maxAmountOfBets = 1 //Maximum amount of bets can be made for each game by each user
   uint public limitAmountOfBets = 3; //Maximum amount of bets for each game
   uint public numberWinner; //Number that won last game
   address[] public players; //Players
   mapping(uint => address[]) numberBetPlayers; //Who bet for which number
   mapping(address => uint) playerBetsNumber; //Number bet by each player

   modifier onEndGame() {
       if(numberOfBets >= limitAmountOfBets) _;

   //constructor - set bet amount and max bets in each game
   function Casino(uint _betAmount, uint _limitAmountOfBets) {
       owner = msg.sender; //set creator of contract to owner

       if(_betAmount > 0) betAmount = _betAmount;
       if(_limitAmountOfBets > 0) limitAmountOfBets = _limitAmountOfBets;

       oraclize_setProof(proofType_Ledger); //arge

   //check if player exists in current game
   function checkPlayerExists(address player) public returns(bool) {
       if(playerBetsNumber[player] > 0) return true;
       else return false;

   //bet function
   function bet(uint numberToBet) payable {
       require(numberOfBets <= limitAmountOfBets); //check if limit has been reached
       require(!checkPlayerExists(msg.sender)); //check that player hasn't bet before
       require(numberToBet >=1 && numberToBet <= 10); //check that the bet is between 1 and 10
       require(msg.value == betAmount); //check that ether send by sender is equal to bet amount

       playerBetsNumber[msg.sender] = numberToBet;

       numberOfBets += 1;
       totalBet += msg.value;

       if(numberOfBets >= limitAmountOfBets) generateNumberWinner();

   //generate random numbers using oraclize_newRandomDSQuery function
   function generateNumberWinner() payable onEndGame {
       uint numberRandomBytes = 4;
       uint delay = 0;
       uint callbackGas = 200000;

       bytes32 queryId = oraclize_newRandomDSQuery(delay, numberRandomBytes, callbackGas);

   function __calback(bytes32 _queryId, string _result, bytes _proof) oraclize_randomDS_proofVerify(_queryId, _result, _proof) onEndGame {
       assert(msg.sender == oraclize_cbAddress());

       numberWinner = (uint(sha3(_result))%10+1);

   function distributePrizes() onEndGame {
       uint winnerEtherAmount = totalBet / numberBetPlayers[numberWinner].length; //how much each winner will get

       for(uint i = 0; i < numberBetPlayers[numberWinner].length; i++) { //sent ether to addresses

       for(uint j = 1; j <= 10; j++) {
           numberBetPlayers[j].length = 0;

       totalBet = 0;
       numberOfBets = 0;

metamask problem

  • give gas value is 4469391 Commented Feb 20, 2018 at 6:13
  • creation of Casino errored: Gas required exceeds limit: 4469391. An important gas estimation might also be the sign of a problem in the contract code. Please check loops and be sure you did not sent value to a non payable function (that's also the reason of strong gas estimation).
    – shotofcode
    Commented Feb 20, 2018 at 6:30

1 Answer 1


After I enabled 'Enable Optimization' MetaMask gas limit decreased and I'm now able to deploy the contract. But still not %100 sure what's going on with MetaMask and also Optimization mode.

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