For everyone that doesn't take the time to figure things out on their own yes level 10 will be brutal because the walk through is wrong. The easy way to do level 10 is to run down to the bottom, place a standing man where the last not active spike boxes are, back up and send a running box at him then place another standing boxman to keep him running back and forth. Now go back up to the top and jump over the ledge and down to the last lever. Run over it as the boxman is running away from it, which kills the first box man, then run over it again before the boxman gets back to it, and then over it once more to open up the end for the running box man. You do not have to race to the bottom. Keep this post alive