Nightmare

Nightmare is a secret dungeon in Brave Dungeon. It lasts 5 floors and Zizou Olympia is the boss. It unlocks after beating Godshill at least once.

Gameplay
Nightmare is intended to be the hardest dungeon. Many of the enemies are extremely strong, and require the best gear to beat. Poison tiles are also frequently featured, damaging the player if they walk over them. Every playthrough, the maps are randomized, and stairs are not present. Jump also cannot be used in this dungeon.

Every floor has the player fight every other dungeon's superboss (save for Bajel) every floor. At the end, the player fights Zizou Olympia. If the player beats her, they get the true ending, and also unlock Zizou's Solitary Journey, which is a Zizou-only mode.