Fun to play. Also how the ads don't interfere with game play make it more exciting. However the codes for the keys don't show as it should. If you guys don't plan on giving codes to the players don't add that option. After all, it is better for that option not be there than to play with that option there while getting nothing. Also I suggest you guys add some sort of criteria, say complete task or set of takes for keys, than just asking the players to ambiguously play to get keys.