1 Create any number of Sudokus and solve them. Store Sudokus for in-depth study.
2 Solvability guaranteed. Drag digits from the palette or click on the board
3 and wait for the desired digit to appear. Neither method will let you place
6 Includes automatic markup.
7 You can input external sudokus for solution.
11 WWW: http://gap.nongnu.org/sudoku/index.html