is a puzzle game developed by Mitchell Corporation for the Nintendo DS. It was a launch title in Japan, Europe and China. In the game, players use a stylus to draw lines on the DS's touch screen, flipping black and white tiles to clear puzzles. Gameplay Select tiles by drawing lines over them with the stylus. Selected tiles will flip from black to white or vice versa. In the standard Tetris-like challenge mode, players must make room for falling tiles by clearing rows as they pile up on the bottom screen. Rows are cleared by flipping the tiles to make rows that are all black or all white. Surrounding the main puzzle area are gray "neutral" tiles that have no effect on the puzzle but can be used to flip disconnected groups of tiles in a single pass. The scoring in Challenge and Versus mode are based on how the lines are cleared; for example, more points are given when more lines are cleared (lines), when numerous lines are cleared with just one stroke continuously (chains), when there are 2 separate lines cleared with uncleared lines between them (split), or when several lines are cleared in one stroke, but different lines have different polarities (borders). Game modes Challenge Blocks of tiles continually fall from above. Players must rapidly clear tiles by drawing lines to create horizontal rows of the same color. The game is over when the blocks of tiles reach the top of the top-screen. There are 10 levels, players advance one level for every 100 lines cleared. Each level begins with the level number drawn with the tiles, and ends with a row of pink tiles. When these pink tiles reach the bottom of the screen, the entire screen is cleared and a 10,000 point bonus is awarded. The lines that fall from the top in each level have characteristics distinct to that level. For instance, the first half of the first level consists of 3 line groups that can be cleared with one stroke. Practice Practice is similar to challenge mode, in that blocks continuously fill from the top. However, gameplay is limited to one level. Any level reached by the player in normal challenge mode can be played. There is no time limit, or penalty for not clearing the lines. High Scores Win or lose, if a player scores enough points, they are given a chance