Though horror cameos are plentiful in , some of these character Cameos require specific quests to unlock them, including the murderous robot icon M3GAN.
While M3GAN does not have her own world for players to visit, she can still be found in various other worlds and is unlocked as a playable character.
Specifically, players must unlock her Cameo Quest by tracking her down in one of 's many horror worlds, The Thing. Unlike some of the other Cameo Quests, M3GAN doesn't need your help completing simple tasks in the various worlds.
Instead, you'll need to travel to these other worlds to stop her from invading them. To initially find M3GAN, you'll need to make enough progress to complete the boss fight in level 2.
Afterward, go up the watch tower stairs until you find the purple chest containing M3GAN's Cameo Card. The chest is encased in ice, so you will need to melt it before you can open it.