Erik Demaine and Martin Demaine's Puzzles:

CSAIL Annual Meeting 2014 Puzzle

In what has become a regular event, Erik Demaine and Martin Demaine give out puzzles each year at our lab's Annual Meeting. Here is the 2014 edition.

This puzzle is based on a patented folding puzzle by Harold Edborg from 1942.

Two-page PDF (print duplex, flipping on long edge)

Front side:

[72dpi] [150dpi] [PDF]
Back side:

[72dpi] [150dpi] [PDF]


Fold this 2 × 2 puzzle, only along the lines, down to show one of the two 1 × 1 images. The image will only appear on one side; the other side is unconstrained. Can you solve both puzzles?

Printing Notes

This puzzle requires printing images on both sides with fairly close alignment. This can require some fiddling with your printer or photocopier.

In addition, the puzzle must be cut out, along the outer rectangle and along four slits.

The puzzle was designed for color printing, but it will work fine 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 June 13, 2015 by Erik Demaine.