Each of the 20 levels has a saw and when you pick it up you unlock an achievement. You don't need to do any tasks in the levels other than picking up the saws. Use the level selector to play as the story mode has a life limiter.

Some helpful skill hints: go past the blue extender with the white tip at the maximum length location to have more room to pass through; the key to most ramps is speed, not too fast, not too slow; to pass some obstacles, accelerate before the window of opportunity.

Some level specific tips: at level 10, to your right, there's a shortcut path underneath.



At level 19, I believe it very difficult to go through this path.



Turn left and follow the ledge.



Also the saw on this level is the farthest from the finish line and can go unnoticed.

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