The Bullet Bill is a bullet-shaped enemy that flies in a straight line in the hope to damage Mario, since they hurt Mario on contact. However, they can be jumped on, after which they will be defeated.
Bullet Bills are commonly seen flying horizontaly and sometimes vertically shot Bullet Bills appear, too. The diagonal Bullet Bills from SMW cannot be seen in Brutal Mario. Most of the time they are shot from Bill Blasters, or, in some levels, they are shot from off-screen.
- Some official Bullet Bill variations are based on the concept of homing into Mario, but in different ways than the ones in Brutal Mario.