When I attempt to create my own lesson, I am unable to use the space and backspace (bug). Also, it would be very nice if I could input the letters I want to use for my custom lesson, and have various sequences produced for me (feature request).

Have you tried it in an other browser? It seems so be a Javascript issue in Opera.

All the best from Berlin,
Your Tipp10 Team

The ticket was marked as "resolved".