For the longest time, people (including myself) have wanted to get the Piranha Suit, rather than the Piranha Swing badge, from the Piranha Bean boss. However, as only Luigi fights it, you cannot use the Swing Bros. attack, and until July 2008, no one had found enough Hoo Beans to make the final drink necessary for the Game Boy Horror SP.
Now, nearly all of the hidden Hoo Beans in the game are indicated on the following map sections. Check out Peardian's original M&L: SS maps on
www.vgmaps.com for the complete maps of these areas.
Two beans are unaccounted for, as supposedly, "...an elevated platform that’s right up against the western wall in a small room [in Joke's End] features an Invisible Block", and "A tiny, elevated platform up against the northern wall [of some unclarified part of Bowser's Castle] is surrounded by lava. An Invisible Block floats above this tiny platform." Both are very ambiguous statements, and both Joke's End and Bowser's Castle are playable
after the surfing minigame is accessible.
There is also rumor of a hidden block(s) in Chateau de Chucklehuck, but this could be a confusion with the hidden area containing a Super Nut, Super Syrup, and coins. Also, the Joke's End bean could possibly be located in the room indicatedwith the Scaratroopea and Snifit (marked with a "?").
I am unable to figure out the authenticity (and/or clear identity) of the locations of these Hoo Beans, but at any rate, the 15 pre-Piranha Bean locations should be more than enough to get the Game Boy Horror SP before the boss.
