Oh my god, how is this hard to understand?
Click the boxes on the outside. A laser will shoot through the middle. If it gets to where it needs to go the end will be green, if it doesn't there will be a yellow spot somewhere else. Use the mirrors to get each laser where it needs to go.
As for the other comments: Level 5 is not impossible, in fact I think it's a vital level for teaching players an important fact about the game.
Level 10 goes like: druldrdr
Went to level 110 (which spells out DONE) with 1421600.. the puzzles get ridiculously easy after that.. not sure if they are the same puzzles as the beginning or not. 4/5
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 "Inquisitive Dave"){kind=icon}
 "Flipped Out"){kind=icon}
 "Mine Sweeper"){kind=icon}
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 "DUI"){kind=icon}