Unidasu

Unidus (ウニダス) is a blue variety of Orbinaut that becomes red when an enemy is spotted and sends the four spiked balls around it forward to attack. It appears in the Labyrinth Zone from Sonic the Hedgehog. In North America Unidus is named Orbinaut in Sonic the Hedgehog and Spiky Spinner (see below) in Sonic Adventure.