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Opposing the hero are 1-3 ghosts, each with the color of their respective player. They can inhabit traps, monsters and drop slimes. When the hero dies, he or she becomes a ghost, trying again to become human.
Ghosts are transparent and do not collide with walls or objects. This allows them to float wherever they want on screen. Collecting 6 brown orbs(ectoplasm) that appear onscreen allows them to drop a slime.
Slimes are non-player-controlled monsters. They wander aimlessly, and occasionally will fire three blobs in a line where the human is. They can be possessed and controlled by any ghosts, not just the ones who spawned them. There can be up to three slimes of each color out at a time. If a player that dropped slimes becomes the hero, the slimes will disappear.