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Re:Show HN: I made a deceptively simple but hard sliding puzzle by DerekL on Thursday June 02, 2022 @09:44PM (#31603223)
The hard level is the same thing as The Nowotnik Puzzle, a ZX Spectrum game from 1983.

https://www.emulatorgames.net/roms/zx-spectrum/nowotnik-puzz...

https://www.youtube.com/watch?v=sTLeI5QS8Qw

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