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Quick tip, at the later levels you can jump over a large portion of the obstacles by simply jumping left over some invisible blocks, this will make later levels much easier. Also, you can jump under the spike in levels 10-20, which may seem harder at first but will ultimately make it easier for the later levels 18-20.
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TIP : jumping on an invisible block removes temporarily your ability to double jump !!! damn this game was challenging but i liked it 5/5 !
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I don't mind games being hard as long as controls are responsive, but I found too often double jumps not working for some reason.