Water is a common type of goop that has no effect on its own. Source of water include:
- Water barrels
- Ice bombs
If water is electrified, it will continuously deal damage to enemies and players standing in it. Unlike fire and poison, this will not deal damage to flying enemies such as Gigi. Sources of electricity include:
Water can be frozen into ice, which makes it very slippery unless the player has Heavy Boots. Water can be frozen by:
- Heart of Ice
- Freeze Ray
- Frost Bullets with any explosive weapon
- Frost Giant
- Ice Breaker
- The Judge (ice bullet)
- Mailbox (ice package)
Poison goop poisons enemies and players that stand on it. Sources of poison goop include:
- Poison barrels
Oil is normally harmless, but will be set on fire upon contact with fire or an explosion. Sources of oil include:
- Oil barrels
- Oil lamps in the Black Powder Mine
- Braziers (automatically ignited)
- Enemies (all oil spawned by enemies is automatically ignited):
Green fire is a special variant of fire that does not damage the player, and enemies ignited by green fire will permanently burn. Spreading oil onto green fire will replace it with regular fire.
Sources of green fire include:
Cheese rapidly slows and freezes any enemies that walk into it. Enemies that die while encased in cheese will spawn another cheese pool.
Webs slow the player's movement, but will be destroyed when the player moves off of them. Contact with fire will burn and destroy the web.
Webs randomly appear throughout the Gungeon, and are spawned by Phaser Spiders.
There are a few other types of goop which have no unique effects.