Lava

Lava is the strongest Liquid than water and lava, You can't fall into this liquid once since it will kill you instantly, Unllike water and acid, Lava is more used on Insane and Extreme Maps, Ex, Blue Zenith and Erupted Mines Uses Only Lava (Including Infernal Abyss) While Tower K.O.D Uses both Acid and Lava. Lava can sometime be a really toxic fog like in Collapsing Amenity on the Moving Boxes, If you fell to the fog, You die instantly, Lava can be any type of color, Ex. Red, Blue, Purple (fog), and Green.Unlike Acid and Water, Beginner Doesn't have lava, The maps that use lava:
 * No Beginner Maps
 * Normal Maps: Crumbling Facility
 * All Intermediate Maps
 * All Insane Maps
 * All Extreme Maps

Trivia:

 * Unlike other maps, Collapsing Amenity Uses all type of liquid, Water, Acid and Lava, Water is in the final part, Acid on the 1st and 2nd button, and lava that is everywhere.
 * Vicious Quarry is the only map that uses only lava.