I really didn't have a whole lot of trouble with #35. Just drop the box into the hole. Then drop the wheel onto the box. While the wheel is falling, drop the ambulance onto the wheel and keep it running. It runs into the cop and hit's the switch that gets rid of the racer. Stop the ambulance and start the cop to get to the parking spot.
There's a bug (specific to lvl 18???) that makes it game over as soon as the lvl starts. Don't really know what's going on, and the game isn't interesting enough to bother refreshing the page.
I noticed that the ball sometimes takes a different path, but it seems to be patterned. I mean, it'll take path A, then B, then C, then A again, B again, C again, and so on. It's not random.
I did 9 with only 3 elements. I"m not even sure how to do it with 4. Here's how: Horiz directly under goal. Horiz 2 right from that. Red glow 2 right, 1 down from that.
Mars in 2 days. By day six, I had bought everything and on day seven, after 15 minutes I just left my computer and went to lunch. I came back and it had finished after 39:53 and $15,741,810.49.
Methinks this game is too easy. :)