Joe, if you are talking about when wrap is on and the bottom and right squares come on, if you think about it when it wraps this is supposed to happen.
That's odd that level 3 has a solution. I guess Wikipedia really can't be trusted. It says here that there is no solution for a 4x4.
http://en.wikipedia.org/wiki/Lights_Out_%28game%29
Fixes: Next level starts automatically now when you win. Preloader was incorporated into the file (was separate before). This is good because now the API works. More fixes to come.
I am working to incorporate changes. If you are getting a white screen it's because my preloader is temporarily disabled. Just wait, it will be a white screen and load soon.
To everyone whining about checkpoints. I was one of you. Then I beat it on my 4th try and realize it doesn't need checkpoints. It just needs a little more patience and a tiny bit of luck or skill. Changed my rating to 5/5.
I agree with Rallik. It is quite a good concept though. I don't like these types of games but it is done very well. Something to look at even though it didn't really bother me was some squares went back and forth just outside the play field. Also try to add some sound and spiff up the graphics just a bit (Although it is good enough to not need much more graphics). If you adjust down the spawn rate then you should lower the lives a bit too.