Each level of the dungeon should be slightly larger than the previous, and shouldn’t have any tiles that are impossible to access. There are 20 levels, each getting larger and harder, ending with “Satan’s Hideout”. Every 5 levels, the music and tileset should change to keep it fresh, and maybe a boss battle.
WORLD 1 (LEVELS 1-5) – BANDIT HOLE
Boss: Level 5 - Genie (prebuilt arena, like level 10)
WORLD 2 (LEVELS 1-5) – CRYPT
WORLD 3 (Level 1) - SATAN'S HIDEOUT
This is not a full level, just a prebuilt arena where you fight Satan.