The Blastoid is a type of Badnik that appears in the Sonic the Hedgehog series. Essentially, it is a robotic gun turret; its body consists of a blue-plated dome with yellow highlights and a pair of frowning eyes at its front. Protruding from the dome is a cannon that fires a series of energy pellets whenever an enemy comes into range. The Blastoid can also function underwater.
Sonic the Hedgehog 3
Blastoids appear in the Hydrocity Zone. Only seen in Act One, they are located on a series of bridges that will collapse if the Blastoids are destroyed. The Blastoids are stationary and do not move, their cannons always positioned at a 40° angle. When the player enters their range, they will fire a series of three pellets. These shots are relatively easy to avoid, but if the player has a Bubble Shield, then the pellets will bounce right off. These Badniks can be destroyed by any single attack.
Blastoids once again appear in Hydrocity Zone. Their appearance and behaviour remains the same from Sonic the Hedgehog 3.