10800 Zombies

A wave-survival shooter whose name is its scoreboard: ten thousand eight hundred zombies stand between you and the end, and the number is the whole promise. There is no story to speak of and no map to learn — you hold a position, you shoot what walks into it, and you watch the counter fall. The pause menu is unusually complete for a game this plain, with its own volume and mute controls, which tells you the designer expected long sessions rather than short ones.