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You are a hero raised from the dead by the god Zeus to rescue his daughter Athena. With scenery inspired by Ancient Greece, you have to fight hordes of undead and demons, with a boss at the end of each level until you meet the god Neff, who holds the girl captive.

The Altered Beast title refers to your shapeshifting abilities. In this platformer, you can collect spirit balls by defeating two-headed wolves, allowing you to mutate into different beasts such as a werewolf, a dragon, a tiger, a bear and others depending on the version. Each form, tied to a level, comes with special abilities such as flight and powerful attacks, easily superseding the basic set of punches and kicks in your human form.

The game can be played in single player mode, or in same-screen multiplayer co-op mode.


Altered Beast ZX Spectrum Time your kick carefully when attacking the white beast
Altered Beast DOS Your Mutation - Human
Altered Beast DOS Title
Altered Beast Windows Purple demon

Promo Images

Altered Beast Screenshot
Altered Beast Screenshot
Altered Beast Screenshot
Altered Beast Screenshot


Alternate Titles

  • "獣王記" -- Japanese spelling
  • "兽王记" -- Chinese spelling (simplified)
  • "Jūōki" -- Japanese title
  • "Altered Beast Classic" -- iOS and Android release title
  • "3D Altered Beast" -- Nintendo 3DS title

Part of the Following Groups

User Reviews

Great conversion of the arcade hit, underestimated due to overexposure. Genesis Majestic Lizard (676)
Welcome to your doom Genesis Katakis | カタキス (42793)
Sloooow down SEGA Master System ETJB (480)
An original story comes to life in this coin-op conversion. Genesis aaron pridemore (11)
A cult classic Genesis AaronGamer (45)
Decent platform beat 'em up with impressive werebeast, greek mythology theme Arcade Andrew Fisher (707)
Slightly better than average arcade conversion. DOS gametrader (233)
A particularly good conversion of a particularly bad arcade game. DOS Tomer Gabel (4634)
Nice!!! Genesis Thiago Loureiro (3)

Critic Reviews

VideoGame SEGA Master System May, 1991 5 Stars5 Stars5 Stars5 Stars5 Stars 100
All Game Guide Genesis 1999 4 Stars4 Stars4 Stars4 Stars4 Stars 80
VideoGame NES Jun, 1991 4 Stars4 Stars4 Stars4 Stars4 Stars 80
Nintendo Insanity Wii Dec, 2007 3 out of 5 60
Retro Archives Genesis Feb 22, 2019 12 out of 20 60 TurboGrafx-16 Mar 11, 2020 5 out of 10 50
Retro Archives Commodore 64 Feb 22, 2019 7.5 out of 20 38
Retro Archives Atari ST Feb 22, 2019 7 out of 20 35
Power Play SEGA Master System Jun, 1989 17 out of 100 17
Game Freaks 365 SEGA Master System Sep 05, 2005 1 out of 10 10


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A version of Altered Beast is included in Sega's Smash Pack compilation CD.

Genesis pack-in game

This game was the first pack-in game to come with the Genesis when it first came out in 1989.


The Brazilian Heavy metal band Megadriver, specialized in SEGA MegaDrive music, did a cover of the first level theme, complete with one of the band members saying "Rise from your grave".


The ride-able lizard-birds from Golden Axe make a cameo appearance in the second stage. Bizarrian, a hybrid between an amphibious and a parrot, is also present in Golden Axe.

Version differences

The NES version adds 3 new stages and 2 unique transformations: a shark, an a bird. On the other hand, the SMS version removes the tiger level. The Zodiac release is an emulation of the Genesis version, but for one player only.


  • Power Play
    • Issue 01/1990 - Biggest Failure of 1989
Information also contributed by Mad_Griffith, Matthew Melbourne, Robbb and Zovni

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