A ROM hacker known as gzip managed to decompress Maniac Mansion for the NES and expand the ROM. This allows the graphics and room layouts to be easier to edit.Using this decoded ROM, gzip made an uncensored NES version of Maniac Mansion that is closer to the Commodore 64 version than ever before. Even the infamous uncensored beta ROM doesn't go as far as this one does. It even changes the dungeon layout to match that seen in the C64 version, skeleton and all.
It also fixes some bugs, namely the glitched graphics under the house and on the coin box in the arcade room, and the tape text that was assigned to the current kid rather than to Green Tentacle.
There are also a few patches included if you want to mix-and-match things. One changes the graphics on Ted's calendar to be closer to the original, a second uncensors the text on said calendar, the third changes the pennant to read "L.F.L.U. Rah!", and the fourth brings life to Douglas Crockford's Muff Diver arcade joke.
Oh, and HonkeyKong's mouse hack is also included, making this the ultimate version of Maniac Mansion for the Nintendo Entertainment System.