Mortar is a skill that can be given to a lemming in Lemmings 2: The Tribes. A lemming given this skill fires an explosive projectile diagonally upwards. When the projectile lands, it creates a knockback explosion which sends nearby lemmings flying and stuns them. The explosion makes a hole in terrain, but does not affect steel. This skill is entirely similar to the bazooka, except for the angle at which the projectile is launched.
The Mortar is key to solving the following levels: