Designer: Osanori Yamamoto

This puzzle measures: 55 mm x 55 mm x 55 mm

Material: depends on product variant below

Move: 10.5.2

Kevin Sadler wrote about it:

“Not content with giving us one 3x3x3 cube in a box puzzle (Belt Cube 3), Osanori and Pelikan have released another, even more difficult version, rather descriptively named W-Windows. My copy is made from Oak and Wenge. It will also be made available in Apple and Ovangkol. The name clearly comes from the fact that it has a nice cubic box with 2 windows in it (not the usual diagonally opposite holes) and two of the pieces have a definite W shape to them. With this puzzle, the pieces don’t keep falling out when you play with them which you will come to appreciate because you WILL be playing with this one for a VERY long time! To my eternal shame, it took me a whole week! There are lots of interesting ways to fill the windows but filling two of them simultaneously is really really tough. Then, when you have found simple ways of filling those windows, it becomes quickly apparent that you cannot get them inside the box. You can get one (occasionally 2) but definitely not all 3 inside. The W-Windows is a huge challenge (at least for a dimwit like me) and you will love it. Don’t be tempted to use Burrtools to cheat… you CAN solve it eventually but you really need to think before the solution will come to you. The Aha! moment is phenomenal.”