Atari 2600[edit]
The Atari 2600 version of the game is naturally the most simplistic. With only one action button to use instead of the arcade's four, the door system was simplified substantially by making every door the same color. The button was used for two purposes. Tapping the button quickly activated a dog bone and turned the mouse into a dog. Holding the button down for a longer period of time caused the doors to change. All other aspects of the game are relatively similar.
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Screen
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Coleco box
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Atari box
ColecoVision[edit]
The ColecoVision hosted the most visually accurate version of the game. Just about every aspect of the game made it to the system unchanged. Doors are changed with the numberpad at the bottom of the controller.
Intellivision[edit]
While the look of the game suffers due to the system's resolution, most other aspects of the game are faithfully retained. Like the ColecoVision version, the doors are changed by using the numberpad at the bottom of the controller.