15 Sliding Puzzle
thingiverse
This is a revamped 15-piece puzzle that I discovered online and put my own spin on - just so you know, it's not entirely mine, I stumbled upon it on Instructables! To make this puzzle a real brain-twister, I suggest giving the pieces a good lubricating to prevent them from sticking together. Plus, using different colors can really help you keep track of where each piece goes.
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