Boulder Bowl Galaxy

Boulder Bowl Galaxy is a galaxy found in World 2 of Super Mario Galaxy 2. The galaxy features the prominent use of the Rock Mushroom that turns Mario into a solid boulder. Some planets included in the galaxy are made of rocks and soil and steel platforms. Bowling pin-like enemies are found in the galaxy, which the plumber can bowl over by rolling into them in his boulder form. Rollodillo, the boss of this galaxy is fought here. The music in the level is the same as in Spin-Dig Galaxy.

Rock and Rollodillo
This level features the new Rock Mushroom, which transforms Mario into a rock, which can roll around and smash things. Not much is known about this stage, except that armadillo-like boss named "Rollodillo" is fought here which Mario must defeat using the Rock Mushroom.