An immersive sim (simulation) is a video game genre that emphasizes player choice. Its core, defining trait is the use of simulated systems that respond to a variety of player actions which, combined with a comparatively broad array of player abilities, allow the game to support varied and creative solutions to problems, as well as emergent gameplay beyond what has been explicitly designed by the developer. This definition is not to be confused with game systems which allow player choice in a confined sense or systems which allow players to easily escape consequences of their choices.

System Shock is a 2023 action-adventure game developed by Nightdive Studios and published by Prime Matter. It is a remake of the 1994 game System Shock by Looking Glass Studios. The game is set aboard a space station in a cyberpunk vision of the year 2072. Assuming the role of a nameless security hacker, the player attempts to hinder the plans of a malevolent artificial intelligence called SHODAN.