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Fast Climber

Five cars on five levels need to cross the river. One at a time. From bottom to top.

And you only have enough road for one bridge!

Also there are hydraulic phases between the cars. And you can use the hydraulics controler.

But there is only one hydraulic piston!

So you build a climbing bridge that keeps lifting the piston with it to go higher.

But there is only one hydraulic phase between the cars!

Build a fast climber!