Eerie Guys are dark Shy Guys that usually appear in ghost houses. They are more powerful and are harder to defeat. They now have a black mask and light red robe (or pink) with a white belt and a dark gold belt buckle with light purple boots. They usually hit the player, charge at him, and sometimes throw Shadow Balls. They can only be defeated by using a Star or a Blue Shell.
- If you hit them with hammers, balls or anything that can be thrown, they will catch it and throw it back at you.
- If you try to bump into a Big Eerie Guy while being Shell Mario the Big Eerie Guy will pick you up (when you are dashing in the shell) and throw you back a couple of miles or throw you into a wall (which sometimes contain useful items or power-ups inside it.)