Sudoku is unique puzzle game experience on mobile like real sudoku on paper with pencil :) 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. 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