So, basically, I'm stuck in these two levels.
The Murky Depths one is mildly easy, it's the one you must ramp off a car into an inverted U thingy to open a door and exit the level. I guess I just need to try it over and over, but it anyone could give a hint I'd be glad.

As for Old Ruins, this is that level where you need to make a few blocks (that have wheels over them) disappear so that a plank falls bridging a gap. I've got the plank in place twice after hours of trying, but couldn't find a way that would consistently drop it correctly. Without help, I'm pretty much giving up on this level and finding a way to hack the savegame or something like that.

Thanks in advance!