Template:List of underworlds

Note: Community maps are identified in italics.

Map	Underworld	Features			Notes
		Contains‡	On Entrance	On Exit
Bloodwater		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Bonesaw		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are stunned and must race to a large pile of cash, the first player to reach it deciding the winning team of the match.
Brimstone		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Carnival of Carnage		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by the last team with at least one living player.
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by whichever team collects 200 Ducks, or the last team with at least one living player.
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by whichever team scores 3 goals (1 in Sudden Death), or the last team with at least one living player.
Cauldron		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Corruption		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Players can only use melee weapons and have an endless speed boost while in the underworld. Underworld layout is procedurally generated.
Cursed Cove		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Erebus		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Eyeaduct		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Loot Island Escaping the island grants the Dive Into a Good Book achievement, and with it the Bombinomicon.
Farmageddon		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Health drain only applies while portal is closed.
Ghost Fort		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Loot Island Escaping the island grants the A Lovely Vacation Spot achievement, and with it the Skull Island Topper.
Gravestone		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are placed in Bumper Cars. The winning team is decided by whoever races to the end first, or the last team with at least one living player.
Hellstone		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Health drain only applies after lingering for too long.
Helltower		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	Health drain only applies after lingering for too long.
Helltrain		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	N/A	All players are forced into third-person view and can only use melee weapons. The winning team is decided by the last team with at least one living player.
Krampus		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Laughter		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Being inside after the entrance portal closes will give the player a bomb head, exploding and killing the player shortly after.
Lava Pit		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Los Muertos		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Mannsylvania		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Health drain only applies while portal is closed. Grants the Vampire Powerup upon exit.
Moldergrove		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	Underworld is a 3v3 arena. The team that wins the 3v3 grants guaranteed crits for themselves and the rest of the team. ** If there are not enough players to begin a 3v3 when the timer runs out, anyone present in the underworld is teleported out and given a speed boost.
Monster Bash		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Moonshine Event		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Pit of Death		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Sandcastle		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Slasher		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Soul-Mill		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell	The secret exit also applies the Battalion's Backup buff.
Spookeyridge		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell
Terror		Health drain  Template:Dictionary/common strings/hazards  Magic Spells	Healing  ÜberCharge  Crits  Speed	Healing  ÜberCharge  Crits  Speed  Magic Spell

^‡Hazards do not include pitfalls or similar environmental hazards, as these are found in almost all underworlds.