This isn't a puzzle, per se. It's actually a series of puzzles. Some will be obvious right away, some will be not so obvious... Most of the levels' challenge really relies on what kind of thinker you are. Do not get discouraged; these are supposed to be challenging.
No spoilers. If you've beaten a level, and you're talking to someone who hasn't, don't go and tell them how to beat it. It's no fun for the people who haven't beaten it yet to be told the answer. In that same vein, it's against the rules to go looking for spoilers. It's much more satisfying to get the answers yourself.
If you're ready to start, then go ahead. Don't get frustrated... Sometimes the answers are just waiting
in the dark.
http://www.weffriddles.com/I'm stuck on Level 3, which looks like it should be really simple!