Today (2018-07-17) the most common game Counter Strike is released within Bitcoin Mode,

the game with original gameplay, paying it's players little bitcoins when killing enemies.
game mainly has 2 options, Single player which is free to play, and Multi-player requires purchase.

Here are screen-shot of gameplay in single player mode :



source :
https://bitcointalk.org/index.php?topic=4691135.0

game official site :
https://counter-strike.cc/