I play a lot of classics like DOOM, Unreal Tournament, System Shock 2. This might take days to finish, but from the new games I do like Killing Floor 2, GTA 5 and Shadow Warrior (both the classic and the new one). I think it's quite hard for me to answer this question, since I like to switch it up from time to time and then come back. I do, however, got back into Guns of Icarus after a very long time. I missed this game, so this is going to be one of the main games I will play now.