Sudoku Shelf is a sudoku puzzle game. Features: Different puzzle types: 4x4, 6x6, 9x9, 12x12. Five levels of difficulty. Undo & Redo functions. Notes. Hint function. Statistics. Tablet support. For each completed puzzle you will get points. The score depends on the puzzle difficulty level, time spent on this game. Attention! For each hint, your score will decrease by half.