Erik Demaine and Martin Demaine's Puzzles:

SoCG 2025 Puzzle

For CG Week 2025, an event containing the International Symposium on Computational Geometry (SoCG 2025), we designed the following puzzle for sharing at the Computational Geometry Washa-Washa workshop.

This puzzle is based on a puzzle by Koichi Miura.

[72dpi] [150dpi] [PDF]

Rules

The goal is to fold the 4×5 puzzle into a 3×3 square so that one side looks like SCG:

The other side of the folding can have any pattern. You can fold anywhere. No cutting.

Printing Notes

Print the puzzle as large as possible on a piece of paper (single sided), and then cut out the square puzzle.

The puzzle was designed for color printing, but it will work on a black-and-white printer.

The PDF file is the best combination of printing quality and small file size. You will need a suitable viewer. Alternatively, you can print one of the images. If you can print images scaled to fit, use 150dpi. Otherwise, use 72dpi.

Last updated May 30, 2026 by Erik Demaine. — Accessibility