Impossible 3x3 Slide Puzzle (Prank)
thingiverse
This is an Impossible-to-solve 3x3 Slide Puzzle. The 7 and 8 have been swapped so that the puzzle cannot be solved. Print this and give to nerdy friends to frustrate them, but also be kind and show them this video to explain the math behind why it can't be solved: https://youtu.be/YI1WqYKHi78
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