We have used our tangrams so much! We've used them with reproducibles, games, to invent new "puzzles," and in church activities. The entire family likes to sit down and "race" to solve a tangram puzzle helps us keep our visual thinking skills sharp! The kids love to beat out mom and dad, which is one reason this kind of activity is so great it isn't necessarily age that wins, but perception. Tangrams come in 5 different colors (red, blue, yellow, green and magenta) and are based on a 4 inch square. We'll assort colors if you order more than one set.