in some levels there are bouncers next to elevator that allow you to trigger the elevator without going down. this then causes the next level to load but the robot only sometime move. i, personally, don't mind this seeing as it is extremely hard to do but if you can try it then you can see. Also it is a really easy way of beating chapter 2 seeing as the level with the spike 'wall' this can be easily done on.

Hello and thanks for the report! Yes this is a known exploit with a few map-specific files on our bug tracker. It used to be a lot worse when the sawblades would actually throw you high in the air. These days it's on only a few levels, and it's increasingly harder to do, but nonetheless we should fix them some day. Whenever there is enough time to get to the list of the many, many bugs in the current build of the game. ;-)

-Cheers