Great puzzle, totally logical (with temps). But to me the hints were misleading.

Hard to start. Temporaries needed a lot.

Thank You.

Whew~ Challenging to start, but nice result. Thank you for the puzzle!

Once open is laughably simple, but I can't believe the amount of temporaries I needed for this!
Logically beautiful!

Hard work at the beginning. I utterly enjoyed it. Incredibly easy at the end. Thanks.

Hard.