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Onset

Onset is an open world Lua scripting sandbox without predefined goals. Choose from hundreds of Lua functions from our Developer Wiki to create your own scripts and gamemodes. Onset is a perfect starting point for beginners interested in learning how to program.

Steam Page
Release
December 13, 2019
6 years and 233 days ago
Steam Reviews
Mixed774 reviews66.9%

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Latest Contributor: IGF TeamEdit notes
Updated: Jul 11, 2026Developer scaleThe operating scale of the game's developer.
Updated: Jul 11, 2026Publisher scaleThe operating scale of the game's publisher.
Updated: Jul 11, 2026Publisher statusHow the game's publishing relationship is classified.
Search Google: How is Onset and Blue Mountains funded?FundingThe known source of funding behind the game.
Search Google: Who controls the creative direction and IP for Onset and Blue Mountains?Creative controlWho appears to retain creative control of the game.
Updated: Jul 11, 2026Release statusWhether and how the game has been released.

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About the Game

Onset is a scripting sandbox game made from the ground up for multiplayer. Create and host your very own experience in Onset using Lua scripting functions. Or just enjoy the different game modes created by other players.

Key features:
  • Over 400 Lua functions to customize the world.
  • Spawn cars, helicopters, NPCs, objects and more with Lua functions.
  • Load custom maps.
  • Singleplayer (localhost) and multiplayer.
  • 300 player dedicated multiplayer servers. You can host your own server with your scripts.
  • Import characters, animations, props, sounds, particles and more.
  • Various types of vehicles with damage model.
  • Weapon modding including configuration like damage.
  • UI customization with HTML/CSS/JS.
  • High quality in-game VoIP solution.

What can I do in Onset?
By default the map in Onset is completely empty. The Onset Developer Wiki holds a list of all Lua functions including descriptions on how to use them. With those functions you can write your own game mode scripts that either run on the server or game client. This way you have endless possibilities to realize your idea in Onset.