Enemies can be anything that can't be jumped into but can be killed by shots or landing on them. Such things are like UFOs and monsters. These require from one to five shots to kill. All of them take one jump to kill. The only enemy that takes five shots to kill is the mobile one, it moves up in a side to side motion and looks like an owl in all themes except Jungle theme and Space theme. In Jungle theme, it appears as a butterfly and in Space theme it appears as a satellite. All enemies are commonly referred to as monsters.