Added February 2021

An electrical storm has knocked out all the lights in Alice's house. Bob the electrician arrives to find that the circuitry controlling the light switches has been completely messed up. Try as he might, he is unable to fix them. All he can deduce is that pressing either of the two switches will always turn a single light on or off. Can you help Alice find the correct combination of button presses to turn all five lights back on, and in as short a time as possible?

There is no hidden trickery going on behind the scenes in this maze: the effect of each button is completely determined by what you can see on the screen. I'd suggest making a map of the maze if you are struggling to work it out in your head. Refresh the page if you want to reset the puzzle and start again.