Here are some hints.
There are a couple ofd ways to do the boulders but we will use this one below.
Start with the top-left boulder to the blue button.
Then the bottom-right one left on the green button.
The top-right one on yellow.
The right box on red.
The left box to put a flame out.
Make sure the travelator is down to the lowest point so you can get to it when the gates are closed, you will need it later to get to the pink button.
After you use the left box to put the flame out on the left push the right box down off the red button into the water right of the travelator then travelate left then down collecting the coin.
Collect the coin below the open blue gate.
Now push the boulder on the blue button down into the water then trevelate up the right then up collecting that coin.
Push the middle grey on the green button down into the water.
Push the remaining two boulders to the right then push the right one down onto the conveyor to the white button.
Push the left boulder down then left to put out the flame and act as a stopper for the travelator.
Head up to collect the upper coin and step on the pink button,
collect the rest of the coins or coin and exit.
PS-Amnon, if your talking about the key trick with the boulders it looks like you did it the way I do it.
The way above is the way Marinus did it.
I start out by pushing the two lower boulders to the left then go from there.
Marinus found an easier way.
