v2.3 (Released on 24/02/2010)

New features:

1. Two new techniques are added for solving and generating puzzles.
2. Updated software constructure to allow easy extension for future.
3. Enhanced software safety.
4. Other miscellaneous modifications.

v2.2 Build 2633 (Released on 18/03/2007)

New features:

1. The bug of showing “Trial Expired” on first run is fixed.
2. Other miscellaneous modifications.

v2.2 Build 2600 (Released on 14/02/2007)

New features:

1. Multiple options for hint system is provided.
2. Three new techniques are added for solving and generating puzzles.
3. The bug of timer is fixed.
4. A few adjustments are made to the Candidates Elimination Techniques.
5. The serial number generation algorithm is enhanced.
6. Other miscellaneous modifications.

v2.1 Build 2538 (Released on 14/12/2006)

New features:

1. Number dialer pad is provided for fast input.
2. Support mouse wheel to switch quickly among numbers.
3. Multiple input options are provided to satisfy all your needs.
4. Number filter can help you quickly locate the related numbers and candidates.
5. Puzzles can be copied into clipboard either in text format or as an image.
6. Puzzles can be saved in 4 different text formats and 5 different image formats.
7. The ongoing game can be saved even it is undoed or redoed. And it can be restored at any time.
8. Creating and designing your own game is now supported.
9. Other miscellaneous amendments.

v2.0 Build 2521 (Released on 26/11/2006)

New features:

1. Serial number generation algorithm is updated. Machine code is no longer needed for registration.
2. Other miscellaneous amendments.

v2.0 Build 2516 (Released on 21/11/2006)

New features:

1. 'Direct Elimination Techniques' are added as a powerful supplement to the 'Candidates Elimination Techniques'.
2. The 'User Mode' and 'Logic Mode' are combined together to greatly promote the function of the system hints.
3. The status bar is replaced by an information bar, which provides detailed information on user's every move.
4. 'Undo' and 'Redo' functions are provided.
5. 'Generate candidates' and 'Automatically generate candidates' functions are added.
6. Context menu is added.
7. Multi-lingual interface is provided. Currently it supports English, Simplified Chinese and Traditional Chinese.
8. Help file is fully updated, with the addition of the illustration of 'Direct Elimination Techniques'.

v1.1 Build 2489 (Released on 25/10/2006)

New features:

1. The errors in the swordfish technique are mended.
2. Progress bar for creating a new game is added.
3. The bug of showing 'Unregistered' when successfully registered under the main interface is mended.
4. Help file is fully updated with the addition of detailed illustration of the 'Candidates Elimination Techniques'.
5. Other miscellaneous amendments.

v1.0 Build 2480 (Released on 16/10/2006)

Features:

1. It can automatically generate 5 different levels of puzzles unlimitedly. It can generate as many as tens of puzzles each time and show you the most difficult one.
2. It provides two modes for user to solve the puzzle, namely as User Mode and Logic Mode.
• User Mode: Users can input the numbers freely to solve the puzzle and can get hints when he meets difficulties.
• Logic Mode: The puzzle will be solved step by step with detailed analysis, whereby users can learn the skills.
3. It supports not only mouse input but keyboard input as well. This helps to increase the puzzle solving speed.
4. It has a nice user interface which makes user comfortable all the time.