One of my favorite puzzles is called “pentaminoes.” A pentamino is a shape made by joining five squares together along their edges. There are twelve distinct ways to do this, not counting reflections and rotations. A complete set has one of each.
Since there are twelve pieces in a set, each with an area of five, the area of the whole set is 60 squares. So it’s no surprise that the most common pentamino puzzle is a 6 x 10 rectangle.
Here’s one I designed for the GF. I’m more than pleased with how it came out.
Since we’re showing ours, here’s a set I borrowed off of the web (licensed for commercial sale, I promise!) and have made a dozen of to sell on the web and at an event this weekend. Crossing my fingers on that, but I’m happy with the result.