Dragonking.io Is a webgame that lets you earn Eth coins. It also offers a web wallet for bitcoin, eth and litecoin, so its a nice package.
Entropia Universe is a MMorpg with a real cash economy. The ingame currency can be converted to dollars, so you can cashout your earnings. Its currently exploring the world of crypto with deeptoken although is hasn't taken off just yet.
rollercoin is a game where you play games to upgrade your game mining rig. once you play enough games, you actually mine bitcoin.
