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Once you get to the jeep, use plank as a ramp to move the jeep to and fro. Then use the knife and hit the rope holding the upper ladder, and then push the rock.Now go back to the jeep and push the other rock(on which you stood to jump to the ladder) onto the jeep. Move the jeep over to the right, now get off the jeep and click on the rock(on the jeep) to push it down to continue to the next screen.
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y cant i jump on the rock on level 13? THIS IS BULLSHIT! i even checked the walkthroughs and everything, im doing it exactly right, but he just OWNT JUMP ON THE FREAKING ROCK!