I used to play Doom (the original 1993 version) and Quake for hours and hours. Loved them! Unreal tournament, too.
Unfortunately I can’t play FP/FPS games any more because they give me motion sickness. Not even the slow-paced stuff such as the Myst series (loved those) or the Tomb Raiders.
Now my Go-to games are the Don’t Starve range and bits and pieces that take my fancy – Limbo and Tharsis are good for a half-hour diversion.