Mirror (ミラー) is an enemy Badnik that appears in Sonic Advance.
Mirror is a pointy defensive robot shaped like a silver octahedron, found in Egg Rocket Zone and Cosmic Angel Zone. It spins around back and forth in the air, occasionally opening to fire energy shots from its internal cannon in the direction it's facing. When it opens, this is also the player's chance to attack it, however they should avoid touching the energy shots.
This Badnik does not appear when playing in Easy mode.