NonoCube from Graycode Software takes the familiar picross puzzle and bumps it into the world of 3D. Now, instead of filling in squares on a flat grid, you carve out a shape by twisting and turning a cube shape floating freely in space. The same rules of logic still apply, you just have another dimension to worry about solving!

NonoCube's interface is pretty easy to use. Tap and drag the screen to rotate the cube. Use the bomb and shield icons to destroy or protect blocks respectively, or unleash the power of row-by-row marking when you know the fate of a large group. Floating arrows allow you to hide faces of the puzzle one layer at a time so you can see blocks in the center of the shape. By using the number clues marked on some of the outside squares, you can slowly remove boxes until all that's left is a cute little turtle!

There are several 3D picross games floating around the mobile markets, but NonoCube hits a comfortable balance between challenge, ease of use, and simplicity. 60 levels are included in the standard download with the option to grab additional packs via in-game purchase. That's enough puzzle solving to keep you busy for weeks on end!