Quark

First lot of attempts and I couldn't find it, second time around I found I'd been moving things unnecessarily and got it.

Roskoe

Crypt

hi19hi19

Undercover

duke6666

For me that one was like entirely new in the game. I can't recall something equivalent in design. It was big fun to me to solve it.

Tilu

Chimney Sweep

VisD

Zebes

Completely baffled, after umpteen tries I was still nowhere near solving it.  Then it clicked and I had to kick myself for not seeing the solution, so simple, yet so tricky (for me).

Siege

Gridlock

Gauntlet

For me, tricky, I couldn't improve on 2 off for ages till I tried a slight direction change.

KingOreO

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