Snail Blaster
From Sonic Retro
The Snale Blaster (called Den-den in the Japanese Manual) is a snail-esque badnik found in Launch Base Zone. They trudge up and down walls, occasionally opening their shells; this is the chance to attack them, but watch out, they will fire off a pair of flashing projectiles. This badnik made an appearance in Sonic the Hedgehog (anime).