As Cosmi, players are vulnerable in his alien form. Players zap humans with Cosmi's ray gun in order to trap their identity, which they can then take on by standing on UFO icons marked on the
mini-map. Each human has a different ability that can be used for causing mischief, such as boomboxes, vacuum cleaners or bazookas. Successfully knocking over humans yields coins that are required to complete the goals set in each level. Once pranked, humans will become hostile towards Cosmi and try to attack him. While disguised, Cosmi can take two hits, the first leaving him in underwear—which Dan Whitehead of
Eurogamer described as "a Capcom fetish dating back to ''
Ghosts 'n Goblins''"—while the second one reverts him to his vulnerable alien form. Earthlings will continue to chase and attack Cosmi, forcing him to lose coins, until he can find another UFO to change into another disguise. At certain points in the level, a Panic Time will occur where chaos ensues for a short amount of time. ==Plot==