Sudoku (originally called Number Place) is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids that compose the grid contains all of the digits from 1 to 9.

    - four different difficulties
    - hundreds of puzzles for each difficulty
    - auto-save your progress for each puzzle
    - unlimited undo/redo
    - auto-fill drafts
    - hint system for beginners
    - color input system for experts
    - clean interface and smooth controls
    - google play games achievements
    - phones and tablets support

    HELPFUL FEATURES (optional):
    - selection modes: select first or number first
    - pencil modes: automatic or manual
    - keyboard configuration: three rows, two rows, one row
    - direction highlight: vertical and horizontal highlight
    - number finder: highlight all occurrences of a number
    - number counter: show a counter for each number
    - rule violations: game rule warnings highlight
    - keyboard highlight: shown if number count is correct or incorrect
    - multiple color input (advanced): use different colors to place numbers
    - automatic error detection: show errors automatically
    - permanent auto-fill: continuously fill all the drafts
    - bigger numbers: large font for better visualization

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