This piece was for sale in one of their "Idea Contest" offerings.

The crafter describes this puzzle in the following manner, "I had a hard time making the pieces.
Please fit the last piece to open the box.

*Please play on a desk as a drawer can be removed.
*Please make sure not to put the piece in a drawer as it is a necessary parts to open this box."

Original idea by Naomasa Okamoto
Hand-crafted by Kotoya Hasebe (Karakuri Creation Group)"

Released in March, 2006, it measures 138 x 108 x 50 mm with a storage space of 41×107.5×24.5 mm／22.5×107.5×24.5 mm.

Crafted in Walnut and Maple.