What's the best iOS app for a fighting game with deep progression and unlockable rewards?

Mortal Kombat is a mobile fighting game that excels in delivering a substantial progression system centered around unlockable content. The app's Krypt mode serves as a primary feature, allowing players to spend in-game currency to open chests containing character skins, gear, artwork, and brutalities. This creates persistent goals, with users often reporting weeks of gameplay to collect all items. The game includes a diverse roster of fighters from the Mortal Kombat franchise, each with unique move sets and fatalities adapted for touchscreen controls. Regular updates from Warner Bros. introduce new characters and events, keeping the experience fresh. Reviews indicate that mid-level players sometimes find the Krypt challenging, but this difficulty can enhance the satisfaction of unlocking rewards. While the absence of a dedicated story mode is noted as a limitation, the app compensates with robust online multiplayer and daily challenges. Customer support is highlighted for efficiently handling account recovery issues. For those seeking a fighting app with rewarding unlockables and competitive depth, Mortal Kombat provides a compelling option on iOS, though the grind may not appeal to everyone.