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I looked at it but it seems impossible to actually input the combinaison. No matter what i do i either get locked with the second valve or can't use the third at the end. Any tipps ?

That's weird, i would have to test myself i can't really remember to be honest. I don't have the time right now so... but I know the valves are like this:

-First one you can reach is the number 3.
-The second you unlock is the number 1
-The last one is the number 2.

If it can help maybe.