The background humming music is removed and Mario is given a digital sample 'hi-yah' sound when jumping. The sound effects are altered and are generally more crude sounding.

Frames of animation are also removed at the beginning and ending of each level. He is locked in the horizontal roll animation but does not reach for the other barrels or move when rolling barrels vertically. For example in the classic first level, barrels appear from Crazy Kong, as opposed to showing the rolling animations. Some of the game graphics have been re-drawn while Donkey Kong looks almost the same from a side view, his frontal appearance is noticeably different when he opens his mouth he is taller and much more fierce looking. The color palette has been almost completely changed Part I and Part II have different palette choices. The girder text does not flash different colours for a few seconds before stopping, as in Donkey Kong. There is no graphic of Kong on the main screen. The title screen of the game features either the text 'Crazy Kong' or 'Monkey Donkey' written in girders dependent upon which version is running.

The official versions of game came in two different stand up cabinets that featured a large and angry, rather than comic, ape embedded in the artwork. In addition there are other versions of the game that run on Scramble, Jeutel, Orca, and Alca hardware. Crazy Kong (parts I and II) runs on modified Crazy Climber hardware. Crazy Kong Part I shows no copyright or company name on the title screen. There are two versions of the original Crazy Kong and Crazy Kong Part II the differences of which are in minor cinematic artifacts and bugs, color palette choices and minor gameplay differences. Crazy Kong is also known as Congorilla, Crazy Kong Part II, and Monkey Donkey. The game retains all of the gameplay elements of Donkey Kong, but has all of the graphics redrawn and re-colorized. Although commonly mistaken as a bootleg version, the game is officially licensed for non-US markets and is based on different hardware.

Crazy Kong (クレイジーコング Kureijī Kongu?) is an arcade game created by Falcon, released in 1981 and is similar to Nintendo's Donkey Kong.

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