Onset
Early access since Dec 2019
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.
66% positive · 775 reviews
Not yet
In early access, active development but status unclear
Low confidence
Active Development
Development Uncertain
Not yet
In early access, active development but status unclear
Low confidence
Active Development
Development Uncertain
Where to buy
Steam $18.99
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Evaluation
Onset entered Steam Early Access on December 13, 2019, and has never released a 1.0 version. Blue Mountains shipped seven major content releases and numerous feature patches between launch and March 9, 2022, building a clear and consistent update cadence of roughly every 4–6 months for major versions. The March 9, 2022 update (version 1.5.5) was the last communication from the developer of any kind, and it referenced an upcoming Unreal Engine 5 upgrade as a future step — a milestone that has never materialised. Since March 9, 2022, there have been no patch notes, blog posts, announcements, or social media updates from Blue Mountains. As of June 26, 2026, the studio has maintained complete silence for over four years, far exceeding the historical pace of updates. The game remains listed in Early Access on Steam, still purchasable, but there is no indication the developer is still actively working on it or intends to complete the Early Access roadmap.
Evidence
Version 1.5.5 shipped with new Lua functions, audio improvements, and ambient lighting changes. The update noted future work on a UE5.0 upgrade. This is the last developer communication of any kind.
Major update 1.5.0 shipped with C# scripting support, new vehicles, improved vehicle handling, and map changes.
Media
Details
Developer
Publisher
Blue Mountains
Achievements
—
Platform
Windows
Controller
—
Steam Deck
Not rated
Players
Multiplayer · PvP
About this 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:
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.
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.
Are these done yet?
Last evaluated Jun 26, 2026
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