- general
- Plotter für Funktionen z = f(x,y) mit gekachelten Flächen
- Mystic Rose and Handshakes
- Imbalance Problems
- Imbalance Problems
- Square Not Square
- Escherized Tessellation
- Escher's Pegasus Tessellation
- Fortune Telling Cards
- GeoGebra Mind Reader
- Wheel of fortune. Rad van fortuin
- Rolling Quarter Puzzle
- Tibetan Mandala
- Mandala
- Omar Khayyam's approach to solving certain cubic equations
