Swamp Numbers is a free program that helps you solve Sudoku puzzles. You can either work puzzles that it generates or puzzles that you enter from a book or newspaper.
If you need helping solving the puzzles, simply enable Swamp Numbers hint capabilities. You can either have Swamp Numbers simply identify errors you make or ask for hints when you are stuck. For difficult puzzles, Swamp Numbers allows you to enter candidate values in each cell to help you apply more advanced solution techniques.
When working puzzles generated by Swamp Numbers, ten levels are available ranging from simple puzzles to those that will challenge experienced solvers. Swamp Numbers places no limit on the number of puzzles you generate.