20. Picross 3D Round 2
Artists say the sculpture's inside the rock and sculpting is just setting it free. The first Picross 3D, released back in 2009 let us experience that feeling, but now it's made the jump to 3D on the 3DS, the experience is even more visceral and satisfying. Its clusters of blocks have numbers indicating how many blocks in that row will make up the final artwork – say, a dagger or a picture of Mario – while others can be safely chipped away with the stylus. Shapes around numbers give clues about placement, and Round 2 also adds blocks that need to be painted too, adding an extra dimension to the 300 puzzles you'll be chipping away at.