Markiplier has played many games before but what games should Mark have to play as in he must play them as if the universe demands it. In my opinion, the game that I think Markiplier has ot play is TellTale Games' The Walking Dead. He has to play it because it has DEEP emotional connection and both Yamimash and Jacksepticeye have played the game. I would love to see how he would react to the very difficult choices that the game has and his reaction to the immensly emotional ending in season 1 and season 2.
Another game Mark should play is Valiant Hearts. The game has cartoon graphics but, it does use them to hide its most dark secrets and doesn't hold back on what happens to the characters and what went on during World War I.