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The background of the Punch-Out!! microgame is a screenshot taken in an unofficial Japanese emulator known as VirtuaNES, as can be noted by a Windows 9X window framing the background. This window is covered by an illustration of a television in the game.
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The game contains unused graphics from Tennis for the NES. In the Japanese version of the game, the 'Super Nostalgic Entertainment System' is a Famicom (Japanese NES), and one of the cartridges that accompany it in the game is Tennis. Given this, it's possible that graphics from Tennis (and the rest of the games) were going to be used during post-game animations.
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