To kill Boo, you have to get behind or beside him so that he is not looking at you when you are looking at him. Then, you beat him like any other enemy. You can punch him, you can dive at him, you can break-dance kick him, or (this one is my favorite) you can ground pound on his head.
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King Boo is the king of all boos. Boos are a species of ghost in the Mario universe. King Boo is always seen wearing a crown, but sometimes it is different. King Boo is more powerful than most boos, as he can teleport and create solid matter. King Boo is just about always included in every Mario adventure. In Super Mario 64, King Boo serves as an obstacle to get a star in the ghost course. In Luigi's Mansion, King Boo is the final boss in the game and had control of Mario. For more detail on King Boo, go to the link below.
if your talking about super Mario 64 ds there are 2 luigi paintings (1 in the castle and 1 in boo's mansion) the 1 in the castle is fake and the 1 in boo's mansion is the reals one that u can enter by jumping into it.
ITS HARD KINDA BUT I BEAT HIM RULES LISTEN : 1:get in the cage. 2:go in the tiny room. 3 : don't get by fire. 4:then attack
u gotta kill bowser 3 times