Procedural generation refers to content that is created algorithmically, as opposed to manually. It was originally implemented in video games as a workaround to the memory limitations of early hardware; for example, the 1984 computer game Elite used procedural generation to create a universe with eight galaxies, each containing 256 planets, that wouldn’t soak up valuable memory. Today, procedural generation persists, but instead serves as a method for developers to make each play session of their game dynamic. ROBLOX’s Build and Battle, for instance, uses it to create a random swath of jagged terrain for each match.

Cunning ROBLOX users have found ways to implement procedurally generated content in their games. Zombie City!, an abstract – at least, for now – game by user um3k, known outside ROBLOX as Justin Phillips, is one such case. Each time a player starts an instance of the game, it procedurally generates an expanse of terrain and a complete city — littered with zombies.

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