Blaster's artwork from Sonic & Knuckles.
In Sonic & Knuckles, Blasters can be found at Flying Battery Zone, where they start fire small projectiles at the player from their horn-like cannon, which harmlessly bounce off any shield type. Blasters also move slowly which does make them less threat. A simple Spin Jump is enough to permanently dispatch them.
Blasters make a appearance in Sonic Lost World, where they can be found at Desert Ruins Zone 2. In the stage, they are moving backwards on the route at medium speed. Instead of shooting projectiles, they will shoot honey to the game screen, obscuring the player's vision. The honey will eventually disappear from the screen and the player is able to destroy Blaster by doing Homing Attack.