Nets with triangles and trapezoids are hard to picture on paper. Tap “Fold” and watch each face fold up one at a time — then drag to turn it around.
Original problems inspired by solids often seen in Nada and Kaisei Junior High entrance exams. They are not actual exam problems.
These problems can be assigned as homework, one student at a time, with the class mode. Parents can get a progress report.
Kyoten is a puzzle where you look at a model solid, draw its net, and fold it up in 3D. No sign-up needed.