Hypno-boo is a boo that will hypnotize Luigi.The only way to beat it is to suck him up before you look him in the eyes for 5 seconds.If he hypnotizes you,you'll be on the boos' side for a short while, about 3 seconds.He will come up randomly.If you beat all of them, you get 5 Gold Diamonds(10,000,000g).He has 400 HP.

Best places to look for Hypno-boo:

  • In rooms that are odd,like the observatory.
  • In rooms that are hard to get out of.