Use the stylus to draw lines – as you draw lines, tiles will flip from black to white or white to black. Once a horizontal line is all one color, it will disappear. In Challenge Mode, draw lines to clear the board as patterns continuously drop from the upper screen, falling faster and faster through 10 levels of difficulty. In Puzzle mode, solve 100 single-screen puzzles by drawing a single, continuous line to clear the entire board.

• Ready...set...SWITCH! As patterns relentlessly fall from the top screen, draw lines to reverse their polarity and make them disappear. The more you clear, the faster they come...
• Use your head! A hundred single-screen puzzles await! Each can be solved by drawing a single line, so take your time and think them through. Not only that, but you can design your own puzzles and send them to a friend via wireless link!
• Cross out your pals! Play wireless multiplayer matches against a friend; as you clear lines, they'll appear on your opponent's screen, which is visible to you on the upper screen of your DS. Clear lines with question marks on them to get power-ups that make your lines clear faster, block out your foe's border, reverse his or her tiles and more!