Number Master: Run and Merge presents a hybrid gaming experience that merges endless runner mechanics with mathematical strategy elements. Developed by KAYAC Inc., the game occupies a niche position within the puzzle-runner genre, distinguishing itself through its numerical absorption mechanics and obstacle navigation challenges. The core premise revolves around progressively building numerical values through strategic movement and absorption while avoiding environmental hazards. The gameplay centers on swipe-based movement controls that allow players to navigate their numbered character through various stages. The absorption mechanic enables players to consume smaller numbers encountered on the playing field, thereby increasing their own numerical value. Environmental obstacles include electric saws that must be avoided, bridges requiring precise crossing, and ditches necessitating timed jumps. The ultimate objective involves reaching target numbers, with higher levels demanding increasingly large values such as ×777, which requires careful strategic planning and multiple absorption sequences. User interface design employs clean numerical displays with color-coded visual indicators that help players quickly assess relative number sizes during gameplay. The control system responds accurately to swipe gestures, though the precision required for obstacle navigation presents a learning curve. Real-world usage patterns show players typically engaging in short sessions due to the game's level-based structure and occasional difficulty spikes. The visual design utilizes minimalist aesthetics that keep the focus on numerical values and environmental obstacles without unnecessary visual clutter. User feedback analysis reveals consistent patterns regarding both enjoyment and frustration factors. Multiple reviews from June and July 2025, including those from Dewey Johnson (2025-06-20) and Elizabeth Cossa (2025-07-16), acknowledge the game's entertainment value while highlighting concerns about advertisement frequency and progression challenges. Johnson specifically notes that while the game delivers on its advertised premise, the ad implementation may deter some users. Cossa's repeated reviews emphasize the difficulty of reaching high-number targets like ×777 with the numbers provided through normal gameplay. The application demonstrates strengths in its innovative mechanic combination and responsive controls, though it faces limitations in progression balance and monetization implementation. The numerical absorption system creates engaging strategic decisions, while environmental obstacles add variety to the gameplay. However, the high number targets combined with frequent advertisement interruptions may frustrate players seeking consistent progression. Ideal use cases involve short gaming sessions for users who enjoy numerical strategy games with action elements and don't mind frequent ad-based monetization.