Lava is a hazard that first appeared in Meat Boy. It almost exclusively appears in Hell.
History[]
Meat Boy + Meat Boy (Map Pack)[]
Lava debuts in Meat Boy, also appearing in its Map Pack expansion. It first appears in 1. Easy Peasy In this game, it functions as part of the tile set. Contact with lava will kill Meat Boy.
Super Meat Boy[]
Lava reappears in Super Meat Boy, first appearing in 4-1 Boilermaker. Lava in this game is much larger and not explicitly part of a tile set but otherwise will still kill Meat Boy on contact. It appears in almost every level of Hell. It is functionally identical to blood.
In The Cotton Alley, lava is re-coloured pink for 7-13 Pepto and 7-15 Lock Out whilst it is re-coloured white for 7-13X Bleach.
Dr. Fetus' Mean Meat Machine[]
Lava appears in Dr. Fetus' Mean Meat Machine, first appearing in 5-3. It is underneath all crumbling blocks and will kill any clones on contact.