Black Mounds are solid cube-shaped black containers made of several segments of metal. They have a white-multicolored core in their center and two white lines across the middle of each surface from each edge.
The Black Mounds can be encounter in all the Areas of the game. In gameplay, they serve as obstacles blocking the player's path. Like the other Containers, the Black Mounds may also have items inside them.
Black Mounds are unmovable and can only be destroyed by certain offensive Color Powers and Super Sonic. However, not all Color Powers can destroy the Black Mounds at the same rate: the Blue Cube can destroy all Black Mounds in the area with one attack, the Pink Spikes and Purple Frenzy only destroy them upon physical contact and the Yellow Drill takes a couple of seconds to penetrate just one.
- The Black Mound is the third most used Container in Sonic Colors.