http://laser.narr.as/laser.swf
I first found this site a few years ago, but 'refound' it recently. It's fairly self-explantaory - you just need to lights all the lights by shining a beam through them.
I completed it when I first found it, but can't remember how to do them now.
It has passwords, so you don't need to do it all at once.
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Anything good in life is either illegal, immoral or fattening.