After trying several Sudoku games, I happily purchased UniSudoku. Why?

1) The auto-generated puzzles are true Sudoku puzzles. I tried others that were too easy & could be solved by chance rather than logic.
2) The user interface makes it easy to enter numbers and pencil marks - just click in the box. Its the most playable Sudoku I tried by far. It's a bit plain but I prefer that to the garish style of some others. It's the closest I've found to pencil & paper with the advantages of the computer.
3) The highlight numbers feature helps solve hard puzzles. There are some programs with more "solver" capabilities, but this is the one I enjoy playing. I'd suggest reading the user manuel for "Sudoku Susser" to learn advanced Sudoku strategies, but for playing Sudoku - I use UniSudoku.

I actually like this one. The biggest problem with the other Sudoku games is the way they handle the number entry. You usually need to manually type it in, or pick a number and keep placing the same number until you pick a different number.

This game implemented a very easy way of dealing with number entries. I love it! Finally I don't have to battle the software and I can really focus on the game.

Excellent software!