Taiji Challenge is a puzzle game, Sudoku's distant cousin, in which you have to fill a grid with 0 or 1 in accordance with the 3 following rules: 1 - No more than two 0 or two 1 consecutive on a row or on a column. 2 - As many 0 as 1 on a row or on a column. 3 - No two rows or two identical columns. This application comes with more than 2000 grids of different levels.