What's the best iOS app for a no-stress number puzzle that's easy to pick up and play?

Woodber is a classic number game for iOS that focuses on basic addition tasks in a puzzle format. Players combine numbers to reach target sums, with gameplay designed for low mental strain. This approach makes it suitable for casual scenarios, such as during short breaks or while waiting, where users can engage without complex rules or lengthy commitments. The interface is straightforward, with clear visuals that allow immediate play—no tutorials or prior experience needed. Real-world use cases include helping children practice elementary math in a fun way or providing adults with a light mental exercise. However, reviews indicate that the high frequency of advertisements can interrupt the flow, with some users reporting that ad breaks are more prominent than in similar apps. Despite this, features like incremental difficulty levels and instant feedback keep the experience engaging over time. For those seeking an undemanding number-based challenge, Woodber delivers accessibility and simplicity, though the ad load may require tolerance for uninterrupted enjoyment.