The aim of this game is certainly to create fear, but the innocent bystander who catches sight of someone, phone in hand, earphones in, wheeling around in circles, alternatively cursing and screaming in the middle of a room was probably not the intended target. Audio Defence: Zombie Arena (Somethin’ Else, iOS, £2.99) is not just another run-of-the-mill, living-dead mobile title; coming from the developer of the excellent Nightjar, it utilises audible rather than visual clues to terrify the player.

You listen as zombies approach – their location given away by groans, gaseous expulsions, even chainsaws – and then, using the iPhone’s screen and in-built compass, face in their direction and fire. The difficulty increases as different forms of animated corpses crop up, zig-zagging towards you in greater numbers. Weapons can be upgraded but the one tool you’ll never gain access to is your sight, making for a frighteningly frustrating experience.