The Mecha Castle appeared in Yoshi's Story as the easiest of the castle levels on the final chapter. It is home to many large sharp blue and red weapons that the game refers to as swords. Gears are also abundant here, as well as spinning wheels much like the ones from Yoshi's Island. Some mechanical devices will smash together, spelling doom for any Yoshi traversing the castle. This may be the place where the Shy Guys build all their crazy devices.