I made a puzzle game

This evening I had an idea for a small puzzle game and implemented it.

It is called Light Entertainment.

I don't want to give too much away because the aim of the game is to figure out the rules, but the gist is you turn off a light, then another light turns off at random, and this repeats until you either win or lose.

If you figure it out, please let me know. I'd be interested to hear about how you did it: how long did it take? what wrong ideas seemed right at first? how enjoyable was the puzzle?

Also, by way of a small prize, I'll buy a pint for the first person to figure it out.

Good luck.

Update 2015-11-02: Ben Gazzard has claimed the prize, congratulations Ben!