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Sudoktor is a Sudoku solving assistant. It helps you to solve and understand Sudoku puzzles but it can also be used as a Sudoku tool for entering and solving Sudoku puzzles as well as for saving your progress on a puzzle. 
Sudoktor is a very compact program with the following features: 
| - | generates valid 9x9 sudoku puzzles |  
 | - | allows to enter by hand or cut-and-paste standard 9x9 Sudokus |  
 | - | offers an intuitive and quick entry method |  
 | - | shows or hides pencil marks, updates them automatically |  
 | - | offers advanced analysis on demand: |  
  The program exists on four platforms: Windows, Pocket PC, Mac and iOs. The registration code will be working on any platform. Upgrades and updates are and shall remain free. 
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