Shroob Castle was the Shroobified version of Princess Peach's Castle, after the fortress was taken over by the extraterrestrial Shroobs. The dark castle is the setting of final chapter in Mario & Luigi: Partners in Time. Quite the contrary, the Save Album recognizes it as Peach's Castle of the Past, regardless of Princess Shroob's control and the appearance of the castle.
The castle towers were changed into tall purple mushrooms, along with all the pillars and bushes. The castle itself glowed slightly green (but mostly purple) and is completely Shroobified. Inside, a lot of the castle seems the same as the original, only darker and more violet in colouration. Glowing purple mushrooms grow all over and a giant statue of the castle's ruler, Princess Shroob, can also be found here, and Shroob saucers fly around the exterior of the castle. Beneath the castle, is an Underground Cellar, unlike the Shroob castle, it has the same music from the cellars in the original castle. It has a few enemies, most of them being Shroobsworth, Shroob Rex and Soul Bubbles. A Chain Chomp (non-Shroobified) attacks Mario, Luigi, Baby Mario and Baby Luigi here as well.
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