In Development- Available Q3/Q4-2025

Currently being finalised in Lee’s attic workshop, the Mono puzzle will be made exclusively in small batches in Ireland.

The Mono puzzle will be made almost entirely from brass and weigh-in at over half a kilogram. So, even if you can’t solve it, the Mono puzzle will make for an interesting paper-weight, or door-stop!

Opening the Mono puzzle will reward you with an individually numbered and hand stamped coin. No external tools or tapping will be required (or allowed) when opening the puzzle.

On a scale of 1-to-10, where Felix Ure’s amazing Titan Puzzle sets the standard for a perfect 10, Lee rates the difficulty level of the Mono puzzle as a solid 7.