Quidoku

Quidoku is an iPhone Sudoku app with Classic and Killer Sudoku, six difficulty levels, daily challenges, logical hints, and interactive lessons.

Features

  • Puzzle modes: Classic and Killer Sudoku, with six difficulty levels.
  • Daily practice: Daily challenges and an offline puzzle library.
  • Solving tools: Pencil notes, undo, step-by-step hints, and drawing.
  • Learning: Illustrated lessons and hands-on practice.
  • Progress: Game history, statistics, and optional iCloud sync.
Quidoku Classic Sudoku screen, shown in Chinese
App screenshot (Chinese)