function newGame(uint gameId, bytes8 landKey, uint seedBlock, uint userNum, string content) onlyOwner public returns (uint gameIndex) {
        require(indexMap[gameId] == 0);             
        gameIndex = gameNum++;
        indexMap[gameId] = gameIndex;
        games[gameIndex] = Game(gameId, landKey, seedBlock, userNum, content);
    }