Brick 2 x 2 with 'POW' Print

Reference

3003pr9998

BrickLink® #

3003pb120

Brick 2 x 2 with 'POW' Print (part 3003pr9998) is a LEGO element. CollectORbuild's catalog records it in 2 sets, including Guarded Fortress Expansion Set and Monty Mole & Super Mushroom Expansion Set.