How many ways can 14 pieces make a square?
3D print the 14 pieces. Solve all 536 by hand. Follow a printed guide, or beat the clock on screen.
Like a tangram, but ~2,200 years older — invented by Archimedes, and every arrangement here comes from an exhaustive computer search.
The PDFs and on-screen previews here are solution guides, not the puzzle itself — to solve it with your hands you need a physical set of the 14 pieces. 3D print the set I designed (free files) first: everything below, including the on-screen Random Challenge, assumes you already have it.
Get the piece set on MakerWorld🎨 And forget the square! The same 14 pieces make animals, people, ships — whatever you can imagine.
You'll still place your real 3D-printed pieces — this just shows the hint on your screen instead of on a printed sheet.
Reveal more pieces anytime, or peek at the full solution.
12cm square, all 14 pieces — place the real pieces right on top.
Print once and measure the square with a ruler — if it's not exactly 50×50mm, your printer rescaled the page.
Click a square to select/deselect it (outlines only, no labels).