Hands down one of the most beautiful apps currently out there. I bought this one for myself but L Star soon assumed control and LOVES this app. So do I. It’s based on the drawings of Escher, so optical illusions abound, great for stretching those lateral thinking muscles. The object is always simple, press a button, enter a door, but how to get there… The graphics move slowly and elegantly, the design is exquisite and the music is ethereal and relaxing. L Star and I play a couple of screens of this before bedtime stories. Love it for its ingenuity and peaceful play style.