Sudoku meets slider. Slide each row or column in the Sudoku grid until the Sudoku puzzle is finished. This puzzle is next level Sudoku and a great test of your logical ability. The real difficult thing is getting the final pieces of the puzzle in the correct location without moving the pieces you already have in the right location. Three levels of puzzle difficulty including: - Easy (4 by 4 grid) - Intermediate (6 by 6 grid) - Hard (9 by 9 grid)