Clamer

Clamer, or Shell Star (シェルスター) in Japan, is a badnik from Sonic the Hedgehog 3 found in Carnival Night Zone. They are stationary clam bots that fire spike balls when approached. If you try attacking them from above, you bounce off, so you can only destroy them from behind or roll into them.

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Sonic the Hedgehog 3 + Sonic & Knuckles

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Sonic 3 Levels: Angel Island Hydrocity Marble Garden Carnival Night IceCap Launch Base Sonic & Knuckles Levels: Mushroom Hill Flying Battery Sandopolis Lava Reef Hidden Palace Sky Sanctuary Death Egg The Doomsday Other Levels: Azure Lake Balloon Park Chrome Gadget Desert Palace Endless Mine   Bonus Stages Special Stage Sonic the Hedgehog 3 Enemies and Obstacles: Buggernaut Corkey Bloominator Catakiller, Jr. Monkey Dude Rhinobot Batbot Clamer Sparkle Blastoid Jawz Mega Chopper Pointdexter Turbo Spiker Bubbles Mantis Relief Spiker Penguinator Star Pointer Flybot767 Orbinaut Ribot Snail Blaster Sonic & Knuckles Enemies and Obstacles: Blaster Butterdroid Chainspike Cluckoid Dragonfly Eggrobo Fireworm Hyudoro Iwamodoki Madmole Mushmeanie Rock'n Sandworm Skorp Spikebonker Technosqueek Toxomister Sonic the Hedgehog 3 Sub-bosses: Fire Breath (AIZ) Big Shaker (HCZ) Tunnelbot (MGZ) Bowling Spin (CNZ) Big Icedus (ICZ) Twin Hammer (LBZ) Sonic & Knuckles Sub-bosses: Hey Ho (MHZ) Gapsule (FBZ) Barrier Eggman (FBZ) Guardian (SZ) Heat Arms (LRZ) Knuckles (HPZ) Mecha Sonic (SSZ) Red Eye (DEZ) Death Ball (DEZ) Doomsday Sub-boss (DZ) Sonic the Hedgehog 3 Bosses: Flame Mobile (AIZ) Screw Mobile (HCZ) Drill Mobile (MGZ) Graviton Mobile (CNZ) Freezer Mobile (ICZ) LBZ Bosses Sonic & Knuckles Bosses: Jet Mobile (MHZ) Hang Mobile (FBZ) Egg Golem (SZ) Hot Mobile (LRZ) Mecha Sonic (SSZ) Super Mecha Sonic (SSZ) Great Eggman Robo (DEZ) Doomsday Boss (DZ)