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As the headline says, this is an emulator for the ZX Spectrum, so you will need to also have the original Gameboy Tetris rom. Do as described in the notepad document included with this download, and you will end up with some Tap files you can use with real hardware or emulators, but be aware that it only works with +2A, +2B, +3 machines.
At present, Modern ZX-Retro Gaming has 14,834 views spread across 21 videos for Tetris, with the game making up 8 hours of published video on his channel. This makes up less than 0.87% of the total overall content for Tetris on Modern ZX-Retro Gaming's YouTube channel.