Relief (レリーフ Rerifu?), is an obstacle that appears in Marble Garden Zone from Sonic the Hedgehog 3. It also appears in Sylvania Castle Zone from Sonic The Hedgehog 4: Episode II. It is a giant stone face with a red gem on its forehead.
Relief is found carved into a wall, remaining motionless. When the player comes into its range, it periodically fires darts from its mouth in a straight line. Hitting the gem on its forehead three times will deactivate the Relief and open a wall or floor nearby. Knuckles cannot climb on Reliefs.
In Sonic the Hedgehog 4: Episode II, Relief shoots darts at the player as it did before. It is invincible however, as hitting its gem will not destroy it. Reliefs also appear in underwater segments, though these Reliefs blow the player away rather than firing arrows.