What is your favourite dungeon crawler?

1. Retro gaming spotlight
2. RPG

Dungeon crawlers are RPGs in which the player has to explore one or more dungeons (or similar non-open world environments), fight hordes of cunning monsters, looting treasure, gain experience and levels and so on. Usually, dungeon crawlers have simple storylines and a linear progression. A lot of rogue-likes can be described as dungeon crawlers, with the peculiarity of permadeath (permanent death: no saved game to restore).