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Here is a neat comparision of various sudoku solver sites. This lists out the advantages of solving puzzles here. Have fun!
| Site Name | Colour Coded | Pencil | Hints | Multiple Complexity levels | Number Stack |
| www.sudoku-solver.net |  | | | | |
| www.sudoku.com | No | No | No | Yes | No |
| www.dailysudoku.com | No | No | No | Yes | No |
| www.websudoku.com | No | Yes | No | Yes | No |