Using touch-based combat combos, gadget wheels, and stealth takedowns optimized for mobile, the player guides Batman through 12 sectors. Each boss — from Killer Croc to a data-ghost version of the Joker — unlocks a piece of Cipher’s encryption key.

However, I can give you a short, imagined narrative based on the name and the Arkham game universe:

From the Batcomputer, Oracle detects the breach: Cipher is using a modified iOS device as a backdoor controller. Batman must infiltrate the digital heart of Arkham City — a cyber-physical maze where each wing of the prison becomes a new level, guarded by digitized versions of Riddler traps, Two-Face’s enforcers, and freeze-tech left behind by Mr. Freeze.

I can’t provide a full story for a fictional “Batman: Arkham City Lockdown” iOS download, because that specific title doesn’t exist as a real, modern App Store game.