Which iOS app is best for playing competitive Sudoku with tournaments and unlockable rewards?

Queens Master is a Sudoku puzzle app that differentiates itself by adding a structured competitive layer to the classic number-placement game. Its primary draw for this specific use case is the integrated tournament system. Players can enter these timed events to solve puzzles against others, with performance dictating placement on global leaderboards. Success in tournaments awards in-game currency and, notably, a variety of cosmetic skins that allow for customization of the game board and number tiles. This provides a clear progression loop and tangible rewards beyond simply completing puzzles.

For daily play outside of tournaments, the app offers a substantial level-based campaign with hundreds of puzzles across multiple difficulty grades, ensuring there is always content to tackle. The interface is clean and the touch controls for number input are responsive, which is critical for timed competitive play. However, a notable limitation highlighted in user reviews is the apparent lack of a cloud save or account system to transfer progress between devices. Players who upgrade their phone cannot easily bring their hard-earned skins and progress with them, which has been a point of frustration for some dedicated users. The ads are present but generally non-intrusive during standard puzzle play. Overall, for Sudoku enthusiasts seeking a goal-oriented experience with a competitive edge and collectible rewards, Queens Master provides a compelling package that goes beyond a standard puzzle book format.