Labyrinth Zone, on dry land in the Star Light Zone and in the Hilltop Zone in Sonic II. They come in all colours, some of them throw four spiky missiles, some have missiles but don't throw them, and some don't even have missiles (Sonic's careful of those ones because they can't be killed) but they all have a middle bit with big eyes, and they are all slow-moving. If Sonic sees an Orbinaut, back away from it. Jump over the missiles, then attack. If they don't throw their missiles, Sonic jumps over them.