This puzzle is based on a folding puzzle by Tsugumitsu Noji.
Fold this 5 × 5 puzzle down to a 3 × 3 square, with one side showing a grid of MITs (one color per column) as shown:
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.