Calling is a horror game that centers around several individuals who find themselves trapped in a ghostly otherworld. It is speculated that if a person dies in a tragic way, then their spirit will be trapped in a world made out of their own memories, known as the Mnemonic Abyss. These characters are left to navigate this separate world without any weapons or defense mechanisms, leaving them vulnerable to the ghosts that inhabit it.
The gameplay in Calling revolves around exploration and puzzle-solving, with players guiding each character through the environment to uncover clues and piece together the mystery of their presence in the Mnemonic Abyss. The characters' cellphone can be used as a tool to connect two places, instantly transporting someone between locations by dialing a number. This feature adds an element of urgency and tension to the gameplay.