Our superb and unique hint system helps you learn various sudoku techniques rather than giving you answers only.

You can generate and solve unlimited numbers of puzzles in 5 different levels of difficulties.

Powerful undo and redo features enable you to review every move you have made.

Various input methods, including mouse input, keyboard input, dialer pad input and mouse wheel support, can always satisfy all your needs.

4 different text formats are supported for puzzle opening and saving. This helps you exchange puzzles with others easily.

You can design a puzzle of your own.

Number filter helps you quickly locate all designated numbers and/or candidates.

Puzzles can be copied into and pasted from clipboard in 4 different text formats.

You can also copy and save the original or current puzzle as an image.

A user-friendly interface is just designed for you.

Powerful user's manual, with illustration of two sets of sudoku techniques, provides you with every detailed information you want to know about.

It supports multiple interface languages: English, Chinese Simplified and Chinese Traditional.