Bill Blasters are the cannons that shoot Bullet Bills in New Super Mario Bros. Wii. They continuosly shoot Bullet Bills in Mario's direction or in two directions. Bullet Bills are black cannons with a skull on their bases. They're sometimes Bill Blasters on Bill Blasters. You'll see this in World 6 (NSMB Wii). That means they shoot Bullet Bills in both directions. Surprisingly, Bill Blasters still shoot Bullet Bills if you are standing right next to the cannon itself. That means a Bill Blaster isn't safe at all.