Do you know any game which actually uses cryptocurrency? I saw a lot of coins which promise this, but usually It ends up in being scams.
Games are for fun, but It would be more satisfying to have a valuable currency for games.
I have seen also many cryptocurrency that is based in gaming. There is an ICO that was launched just months ago and they were successful. The ICO I am saying is Playkey. They are already listed in some exchanges including HitBTC and Playkey (PKT) is already listed in CoinMarketCap. The Playkey team is in constant work in implementing the usage of their token into their gaming platform. This is a great project IMHO.