Donkey Kong Country
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Platform
The developers at Rare intended to develop a Donkey Kong Country game for the Virtual Boy, but it was cancelled. The development went only as far as simple platforming stage which was made using Donkey Kong Land's graphics and rat enemies from Battletoads.
It was previously misremembered by a developer to be an early version of Donkey Kong Country 2: Diddy's Kong Quest.
No real footage of the game was ever found, with mock-ups being found on the internet.