In Muppet Monster Adventure, Kermit and company are turned into monsters, and it's all up to his nephew, Robin, to save them all. The game is a rather uninspired platformer that bears more than a passing resemblance to Spyro the Dragon, and the game engine would later be reskinned for two other titles by the same developer.
The game's premise takes heavy inspiration from a script for an unrealized Muppets Halloween movie known as The Muppets Haunted House, which is pretty neat.
Sub-Page#
Debug Features#
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This needs some investigation. |
Enter any of the following at the title screen. Some codes don't seem to stack, for example, all levels and all morphs.
Code |
Effects |
Notes |
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Up, Right, R2, Square, Left, R1 ,Left, Up, Left, L2 |
Debug display |
Enables a debug display. |
L2, L1, L1, R1, R2, R2, R2, Square, Left, Up |
Tunnel Soak/Consecutive Level Load |
Also enables the debug display, but this time the game stays in the tunnel loading screen indefinitely. Presumably to test loading. |
Square, Left, R2, Up, R1, L2, R1, Up, R2, Up |
Camera Rove |
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Square, Left, R2, Up, R1, L2, R1, Up, R2, Up |
Fly Cam |
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R2, R2, R2, R2, R1, L1, L1, L1, R1, R2 |
Level Select |
Enables a level select on the title screen. |
Up, Up, Square, Down, Down, Circle, Left, Square, Right, Circle |
Open All Levels |
Opens all levels in the hub. |
Circle, R2, Circle, Left, Right, R2, Up, Down, Circle, R2 |
All Morphs |
Grants all Morph abilities front the start. |
Down, L2, R2, R2, Up, L1, L1, R1, Down, Up |
Infinite Time |
Infinite time for mini-games. |
Square, Left, Circle, Right, Down, Up, Square, Down, Circle, Down |
Gallery Unlock |
Unlocks every item in the gallery. |
L2, R2, R1, L1, R2, L2, R2, R1, L1, R2 |
Invincibility |
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Square, Square, Circle, Square, Circle, Circle, Square, Square, Circle, Square |
Ballistic Chicken |
Permanent Ballistic Chicken powerup. |




Crash Handler#
If the game ever crashes, it'll display this crash handler.
Test Level#
A test level named "Secret1" is present on the disc and appears to use older assets that may not be fully compatible with the final game.
Unused Audio#
Pepe#
Being your guide throughout the game, Pepe has the most voice clips out of the cast. Quite a few are left unused, some even describing mechanics cut from the final game.
Clip |
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Clip |
Notes |
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Tutorials#
Clip |
Notes |
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Bosses#
All of the bosses have alternate-takes for their voice-clips. They also have additional sounds for taking damage, though only one clip is used for each character.
Notably, most bosses have a clip of them offering their unique "monster power" to you, suggesting that this was the original-method of acquiring them, instead of collecting the amulet-pieces. Evidence for this also remains within the final retail game itself, in the level "Escape Claws". During the block-moving puzzle (with the three pumpkin-blocks, and three cat-blocks), Pepé comments: "Haven't you outgrown playing with blocks? Well, if you insist, then you'll be able to do it when you rescue Kermin, okay."
By this point in the game, Kermit has not-yet been faced as a boss, but all of the amulet-pieces for his powerup will have been found.
Gonzo/Noseferatu
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Fozzie/Werebear
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Kermit/Ker-Monster
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Clifford/Muck Monster
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Clip |
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Clip |
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Miss Piggy/Ghoulfriend
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Petri von Honeydew/The Master of Ceremonies
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Unused |
Used |
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Clip |
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Gallery Voices#
There's some voice clips of the Muppets that were meant for the gallery.
Character |
Clip |
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Robin |
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Kermit |
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Kermit (Behind the Scenes) |
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Fozzie |
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Dr. Honeydew |
Unused Graphics#
Leftover graphics from what appears to be a demo. Renders of Robin's various forms and an early control scheme referring to cut actions such as the shoulder barge instead of the spin and a butt stomp. The placeholder legal screen seen in the prototypes is also present here.
Unused Videos#
There are seven unused videos, which are static black screens with clip numbers.
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The Muppets series | |
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NES |
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Sega Pico |
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Windows |
Muppet Kids: Preschool • The Muppets: On with the Show! • Spy Muppets: License to Croak |
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PlayStation |
Muppet RaceMania (Prototype) • Muppet Monster Adventure (Prototypes) |
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Game Boy (Color) |
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iOS, Android |
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See Also | |