Ivan's Hinge

Bending and twisting this thing through the challenge cards is strangely addictive — I lost track of time trying to solve just three. The patterns really force you to think in new ways, and the hinge mechanism moves surprisingly smoothly.

The challenge cards really make you think in new ways, and the hinge folds smoothly. Took me a few tries to get the first pattern right, but it’s satisfying once you do.

The hinge mechanism itself is surprisingly smooth and satisfying to manipulate. I wish the challenge cards were a bit thicker, as they've already started to show some wear. Still, it's a clever little brain teaser that kept me occupied for a good while.