Since

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• (in all games since ) - means available in Half-Life 2 and all valve games that were released afterwards

• (in all games since ) - would mean all Valve games except Source SDK Base 2006 and earlier, aswell as mods based on previous version of Source.

• (in all games since ) - introduced in which means it's currently also in all Valve games, except Left 4 Dead engine branch-derived (basically up to ) games/mods and Source 2009 or earlier.

• (in ) - All Source 2013 branch games
• (in ) - Half-Life: Source, Half-Life 2, Half-Life 2: Lost Coast, Half-Life 2: Episode One, Half-Life 2: Episode Two and Portal and any mods based on it.
• (in ) - Counter-Strike: Source, Half-Life 2: Deathmatch, Half-Life Deathmatch: Source, Day of Defeat: Source and Team Fortress 2 (all pre-2025) and any mods based on it.
• (in ) - Counter-Strike: Source, Half-Life 2: Deathmatch, Half-Life Deathmatch: Source, Day of Defeat: Source and Team Fortress 2 (all post Feb 18, 2025 engine update) and any mods based on updated Source SDK Base 2013 - Multiplayer (2025).

Source games in the release order

1. Counter-Strike: Source
2. Half-Life: Source
3. Half-Life 2
4. Half-Life 2: Deathmatch
5. Day of Defeat: Source
6. Half-Life 2: Lost Coast
7. Half-Life Deathmatch: Source
8. Half-Life 2: Episode One
9. Half-Life 2: Episode Two
10. Portal
11. Team Fortress 2
12. Left 4 Dead
13. Left 4 Dead 2
14. Alien Swarm
15. Portal 2
16. Counter-Strike: Global Offensive

Source SDK bases

1. Source SDK Base 2006
2. Source SDK Base 2007
3. Source SDK Base 2013 - Singleplayer
4. Source SDK Base 2013 - Multiplayer (original version on branch, first released in 2014, available under previous2021 beta branch)
5. Source SDK Base 2013 - Multiplayer (2025 version, based on Team Fortress 2 branch)

See Also

• Template_talk:Since
• dump entity sizes - to check entity availability