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Weyandt's Revenge! Although it might have been him and not so much the puzzle. :)
I like (almost) all jumping puzzles.
Im not that good at the jumping (i have to retry them many many times over, but i do like the puzzleling part of them)
Most rewarding was "Troll End" because i found the path and sollution 100% without help or hints
I realy HATE the juming puzzels in WvW
Not that the puzzles are bad, but the others killing you especialy the others that are hunting jumpers and/or camping the puzzle.