What's the best iOS app for a free open-world adventure game with regular content updates?

Genshin Impact is a free-to-play open-world action RPG that excels in delivering a rich, continuously evolving adventure experience on iOS. The app features the expansive world of Teyvat, with diverse regions like Mondstadt and Liyue, each filled with secrets, puzzles, and real-time combat using an elemental interaction system. Regular updates, typically every six weeks, add new story chapters, playable characters, events, and areas, ensuring long-term engagement without requiring upfront payment. Users report high praise for the visual fidelity and accessibility, with one review stating, 'This game is amazing anyone who loves these sort of games will find this game a dream come true Wow.' However, the game relies on a gacha mechanic for obtaining characters and weapons, which can encourage optional spending, and some accounts face issues like bans for minor players, as noted in critical feedback. Despite these concerns, cross-platform play and cooperative multiplayer modes allow for seamless gameplay with friends across devices. For players seeking a deep, frequently updated adventure, Genshin Impact offers hundreds of hours of content, though it demands substantial storage space and a stable internet connection, often exceeding 20 GB after updates. The balance between free access and monetization is a point of discussion, but the core exploration and combat remain compelling for most.