What's the best iOS app for a simple number matching game that's good for killing time during short breaks?

Number Master is well-suited for short gaming sessions during breaks or waiting periods. The core gameplay involves finding pairs of numbers that add up to ten, creating a straightforward puzzle experience that doesn't require lengthy commitment. Players can complete individual puzzles in just a few minutes, making it ideal for filling brief gaps in a schedule. The interface remains clean and uncluttered, with large number tiles that are easy to tap quickly. However, users report that advertisements appear frequently between levels, which can disrupt the quick-play experience the game otherwise provides. The lack of cloud save functionality means progress remains device-specific, though this matters less for casual play. Reviews indicate the game offers just enough mental stimulation to feel engaging without becoming stressful, with some players noting they've returned to it daily for months. The journey mode provides clear progression goals, though completionists mention running out of new content after extended play.