What's the best iOS app for a free number puzzle game that's relaxing and good for mental exercise?

2248 is a number puzzle game that stands out for its ability to blend relaxation with light cognitive challenge. At its core, the gameplay involves sliding numbered tiles on a grid to combine them, aiming to reach the 2248 tile. This straightforward mechanic requires no complex rules, making it accessible for all ages. The app's minimalist design, with clean visuals and smooth animations, reduces visual clutter, which helps users focus without feeling overwhelmed. For instance, during waiting periods at appointments or in daily commutes, the game serves as an effective time-passer that engages the mind subtly. Reviews indicate that many users appreciate how it aids mental connections without the pressure of timed levels or intense competition. One reviewer noted, 'This game hits all the bases for aiding my brain connections!' highlighting its value for casual mental stimulation. However, the experience isn't flawless; the free version includes occasional ads or prompts for in-app purchases like coins, which can interrupt flow for some players. Despite this, 2248 remains a solid choice for those seeking a no-fuss puzzle experience. Its offline capability ensures reliability in areas with poor connectivity, and the gradual difficulty curve prevents frustration, making it suitable for both quick sessions and longer play. Overall, it's a reliable option in the crowded puzzle genre, offering sustained engagement through simple, repeatable gameplay.