Source Engine launch options
26 launch options documented for Source Engine, and the 44 games in the catalogue built on it.
Documented for Source Engine
An engine flag is read by the engine, so it usually carries across the games built on it. Not always: engine versions differ, and a developer can change what their build accepts. Each game's own page lists anything documented for that game specifically.
How to apply a launch option on Steam
- Open Steam and go to your Library.
- Right-click the game and choose Properties.
- On the General tab, find the Launch Options field.
- Type or paste the option (e.g.
-windowed) into the field. To use several at once, separate them with spaces (e.g.-windowed -novid). - Close Properties. Steam saves automatically, and the option applies next time you launch the game.
To remove one, reopen the same field and delete the text. Options are game-specific; an option that helps one game may do nothing (or misbehave) in another.
Worth knowing: a launch option can break a game's rendering, reset local settings, or trip anti-cheat in multiplayer. Read the description first, add one at a time, and treat anything rated above Safe as a deliberate experiment.
Source Engine games in the catalogue
Each with the number of launch options its page lists.
- Alien Swarm11 launch options
- Apex Legends™17 launch options
- Black Mesa18 launch options
- Bloody Good Time11 launch options
- CONSORTIUM11 launch options
- Counter-Strike: Source18 launch options
- Dark Messiah of Might & Magic12 launch options
- Dark Messiah of Might & Magic13 launch options
- Day of Defeat: Source13 launch options
- Day of Infamy17 launch options
- Divinia Chronicles: Relics of Gan-Ti11 launch options
- Dystopia11 launch options
- Empires Mod17 launch options
- Fistful of Frags21 launch options
- Garry's Mod24 launch options
- Half-Life 220 launch options
- Half-Life 2: Deathmatch16 launch options
- Half-Life 2: Episode One14 launch options
- Half-Life 2: Episode Two13 launch options
- Half-Life 2: Lost Coast14 launch options
- Half-Life Deathmatch: Source13 launch options
- Half-Life: Source15 launch options
- Insurgency14 launch options
- Left 4 Dead14 launch options
- Left 4 Dead 224 launch options
- No More Room in Hell20 launch options
- Nuclear Dawn17 launch options
- Pirates, Vikings, and Knights II13 launch options
- Portal16 launch options
- Portal14 launch options
- Portal 212 launch options
- Portal 210 launch options
- Postal III15 launch options
- SiN Episodes: Emergence12 launch options
- Source Filmmaker14 launch options
- Team Fortress 224 launch options
- The Ship: Murder Party11 launch options
- The Ship: Single Player11 launch options
- The Stanley Parable19 launch options
- Titanfall® 224 launch options
- Vampire: The Masquerade - Bloodlines17 launch options
- Vindictus13 launch options
- Zeno Clash14 launch options
- Zombie Panic! Source17 launch options