Ultimate Sudoku Collection contains several variations of Sudoku game.

Sudoku basic rule: Fill numbers in the board such that every row, column and region contains one occurrence of each number.

Features:
- Beginner, Easy, Moderate, Hard and Expert difficulties for every game type
- Tons of puzzles guarenteed to have only one solution
- Easy note taking
- Autosave the process of unfinished levels
- Record best completion time for each level
- Hint feature
- Achievements

Current Game Types:
- Basic
- Gattai-3
- Gattai-3 Diagonal
- Gattai-3 Anti-Diagonal
- Butterfly
- Sohei
- Flower
- Samurai
- Samurai Jigsaw
- Samurai Diagonal
- Samurai Anti-Diagonal
- Cross