Box of the Celts is a very strong contender for being the hardest sequential discovery puzzle out there! But it's very fair with it's difficulty, so I can't truly say it's the most difficult puzzle in the world. I'm looking at you SMS Box and I still say you are very unfair with your solve! It involves aspects from puzzle boxes, puzzle locks, disentanglements, coordinated motion, mazes and hidden mechanisms to torment you!BotC by Numbskull Puzzles or Matt M, is diabolical. It's surprisingly stra...
$275.00