Level 14 is possible in the webplayer. I just created a short video for it here:
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Alright thank you, but isn't it kind of odd that the solution in the walkthrough doesn't work in the webplayer? I tried it again and your method is really hard to pull of (so unlikely the intended solution). I found that if you stack two guys on top of each other and quickly press the up key mutliple times, the stack of them moves up indefinitely.