This NES Tetris-themed skin was made to celebrate the Tetris series' 40th birthday, and the Game Boy Tetris-themed skin was to celebrate the 30th anniversary of Game Boy Tetris 1989. It would be awesome if Tetris 99 were to promote Nintendo Switch Online by having skins based on the Nintendo 64 games that can be played on the Nintendo Switch Online Virtual Console. In WinBack: Covert Operations, the music speeds up at 50% health (yellow), and the music gets even faster at 25% health (red). Since the WinBack ground theme is the only song to get damage remixes in the Nintendo 64 version of WinBack: Covert Operations, a WinBack 64-themed skin would use the WinBack 64 ground theme at 99 players, the 50%/yellow HP theme at 50 players, and the 25%/red HP theme at 10 players. By speeding up the music at 50 players and then making the music even faster when 10 players are left, the WinBack 64-based music scheme would be much more anxiety-inducing in Tetris 99 than in even the hardest parts of WinBack 64.