What's the best iOS app for learning Sudoku from scratch with helpful tutorials?

Sudoku is particularly well-suited for users who want to learn the puzzle from the ground up. The app's primary educational feature is its 'Smart Hints' system, which doesn't just provide an answer but explains the specific solving technique required. For example, if a user is stuck, the hint will name the technique, such as a 'hidden single' or 'naked pair,' and walk them through the logic to find the solution. This transforms the app from a simple puzzle collection into an interactive tutor. The interface includes a running counter of how many of each number (1-9) remain to be placed, a visual aid that helps new players track progress and understand the puzzle's constraints. For real-world use, a commuter could use these hints during a train ride to gradually grasp more advanced strategies without needing external guides.

Feedback suggests the learning curve is well-managed. Reviews indicate the app has successfully taught players who 'never understood this game.' A minor imperfection noted by some users is that the hint tutorial sometimes requires adding pencil marks it later tells you to remove, which can feel slightly redundant. However, the overall implementation is considered thoughtful. Additional features like a long-press gesture to temporarily switch to 'number-first' input cater to different playing styles without forcing a permanent settings change. The ability to match the device's dark/light mode provides a comfortable viewing experience during extended learning sessions. It’s a comprehensive tool for building Sudoku competency.