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Maniac Mansion Decoded

Hack of Maniac Mansion


Maniac Mansion for the Nintendo Entertainment System uses a simple compression scheme for it’s graphics and layouts known as Run Length Encoding (RLE). The encoding makes it very difficult to edit any of the layouts or graphics in the game.

This hack expands the ROM and decodes all of the encoded data to make it very easy to edit graphics and layouts. The number of tiles for each room is also maximized to make room for new graphics. A lot of space is freed up as a result which makes it easier to edit game objects as well as text. As such, this hack can serve as a base for new hacks like Maniac Mansion Uncensored.

The hack also includes the Maniac Mansion Mouse Hack and fixes a few glitches in the game:

  • The glitched graphics in the room under the house are fixed
  • The glitched coin box graphics in the arcade are fixed
  • The leftover pennant object in Weird Ed’s room is removed
  • The leftover keypad object in the hallway is removed

Please PM gzip with any glitches or other feedback.


Use the online patcher at (or the patcher of your choice) to apply the bps patch to:

ROM / ISO Information:

  • Database match: Maniac Mansion (USA)
  • Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
  • File SHA-1: 7317D1F1096B57F6AB8F3001BCDD35665C291B1A
  • File CRC32: 68309D06



RHDN Hack Image


ContributorType of contributionListed credit
gzipHackingGraphics decompression, ROM expansion, assembly code
HonkeyKongHackingMouse Hack

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