Switch Riddle

Press the Button until all section are on. How many steps do you need?

Try to toggle all seven light on with a few moves as possible. But be careful - the neighborhoods will be toggled, too. You should never need more then 7 moves and you can see the nominal step number. It is a tiny riddle, inspired by an exhibit of the Mathematikum Gießen (Germany).

This App is free of advertising. You can find the source code on github.