Half Lid Box by the famous Hajime Katsumoto is a similar challenge to Obstacle Box. With only two layers and one slider, you'd think it was easier. You'd be thinking wrong in this case...while there are fewer pieces, the smaller opening necessitates rotational moves which greatly complicate assembly.
Crafted with lovely accents and our usual precision and strength, Half Lid Box is sure to be a longtime favorite in your collection.
48 copies made for sale, each signed and dated. This puzzle is shipped assembled.