Gritzy Desert

The Gritzy Desert is a large, barren desert in the northeastern-most part of the Mushroom Kingdom. In Mario & Luigi: Partners in Time, the Mario Bros. came here during their quest to find the Cobalt Star pieces. The Koopaseum is located in the middle of the desert, and Gritzy Caves is found below the desert. There are four Dry Bones statues around the desert, that Mario, Luigi, Baby Mario and Baby Luigi must activate. When this happens, the Dry Bones Statues will open the entrance to the Koopaseum.

In Super Smash Bros. Brawl, the stage Mushroomy Kingdom features Gritzy Desert's background music from Mario & Luigi: Partners in Time among other tracks.

Also, Diddy Kong's car, the Barrel Train from Mario Kart: Double Dash!! is buried in the ground somewhere.