The Navigation feature is a convenient function with uses blue numbers to show you the next square to color and columns with squares to mark with an x.
By narrowing down the columns you need to check, you can up the tempo with which you solve the problems.

*You can also prevent the Navigation feature from displaying if you want to solve the puzzles without it.

The improved resolution of the Nintendo DS touch screen makes even finer stylus operations possible.
You can play 15x15 size puzzles comfortably on the fixed screen without scrolling.

*You can also play using the buttons as with previous versions.

There are 3 types of puzzle sizes: 5x5, 10x10, and 15x15.
Don't take puzzles lightly because they're small.
There are plenty of challenging puzzles as well.
Complete a puzzle within the time limit and the illustration will be displayed in color.
You can also adjust volume with the 3D depth slider to give the illustrations depth.