Stop That Roach!, also known as Hoi Hoi: Game Boy Ban (ホイホイ ゲームボーイ版) in Japan, is a puzzle video game for the Game Boy that was developed by Koei. It is a remake of the game Hoi Hoi for the FM-7 and PC-88 computers. The objective of the game is to get rid of all the cockroaches in each level using various tools. The gameplay is turn-based, with the player having to choose between moving, using a tool, or skipping their turn. The player has a set number of moves before the cockroaches start moving and make their escape.
Walgrey in this run completes all 100 levels as fast as possible and successfully forces the cockroaches to move out of Ken and Lily's messy home.