Caged monsters are interactive objects first introduced in level 3 of Powerup.
A caged monster appears as a medium sized, red furry monster, with sharp teeth and large black eyes; it is contained inside a medium-sized cage.
An oversized furry creature stuck in a small cage, it has a tendency to move back and forth, making growling noises when doing so. This can be a challenge for players if they attempt to use it to support the structure they build. When caged monsters make their appearance in a level, there is only one of them seen at a time, except for one stage where four caged monsters are situated behind a panel of glass.
Players can used the caged monster seen in the level as a piece which conducts electricity. When electrocuted, the caged monster becomes still. Another method of calming a caged monster can be done in level fourteen, where a banana crate is provided. If placed next to the caged monster, it will remain still for the duration of the stage.