This is the standard game mode. All unlocked enemies may appear in a standard game.
The remaining 4 types are challenge dungeons, having very specific enemy types and unique appearances. Every challenge dungeon has two bosses instead of one.
Populated by naga, serpents and gorgons. Players will fight Nidhogg and Medusa.
Populated by warlocks, dragonspawn and imps. Players will fight Aequitas and the Matron of Flame.
Populated by zombies, wraiths and vampires. Players will fight the Tormented One and Frank the Zombie.
Populated by meat men, animated armour and golems. Players will fight Iron Man and Super Meat Man.