GiiKER Smart Sudoku Puzzle Games, Original 2500 Challenges Brain Teaser PuzzleINTERACTIVE GAMEPLAY Smart Sudoku is an interactive number placement game console supporting auto timer, hints and 1v1 battle. Follow the puzzle screen to set a game, the goal is to fill in the spaces so that the number does not repeat in each column, row, and box. ENGAGING CHALLENGES Switch between 4x4 and 6x6 Sudoku grids to suit your skill level. With 2500 puzzles ranging from beginner to master level, it ensures an exciting, progressive challenge