Level 72 has been causing a lot of problems for people playing on a variety of devices. The level has been updated and as of the last update, here is how you beat it:
Move the yellow car all the way up, the white car all the way down, the red car a little up, and finally the green car a little down. See related link below for screenshots.
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Yes if you have it jailbroken iPod or iPhone
This level is nearly impossible to explain with words. See related link below for screenshots.
You have to solve the puzzle for each level to get the elevator doors to open and ascend to the next level. See the related questions area for links to the solution to each level.
No.
The knife is on the left side near the bottom. It's hidden horizontally. See related link for screenshots.