The father of the FPS genre and an undisputed classic that paved the way for the legendary Doom. Wolfenstein 3D can be a bit of a hard pill to swallow unfortunately three decades later given its tedious backtracking through its labyrinthine level design and lack of visual variety, but you can't deny that filling Nazi dirtbags full of lead is a blast no-matter how the graphics look, and the final boss of the third episode is fucking brilliant, cathartic, iconic, and worth playing at-least up to that point for alone, it's one Hell of a payoff.