More and more games and gaming platforms start accepting Bitcoin and other cryptos. Like already mentioned Steam. Also, projects like CryptoKitties are games totally based on blockchain (ETH, to be precise). But cryptocurrencies should develop more to attract game developers or publishers. For now, I don’t know any blockchain system which is scalable and strong enough to supply large online games. But the idea is promising, I’d like to see in-game items for BTC in WoW or skins for ETH in LoL. Maybe, we will see such innovations in future.