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Portal - The First Slice is the demo of the game Portal developed by Valve Software, originally made available via a special promotion with sales of specific graphics cards.
| Half-Life series | Half-Life [Blue Shift · Deathmatch: Source · Counter-Strike · Opposing Force · Source] · Half-Life 2 [Deathmatch · Episode One · Episode Two · Lost Coast · Survivor] |
|---|---|
| Portal series | |
| Counter-Strike series | Counter-Strike · Counter-Strike: Source · Counter-Strike: Condition Zero [Deleted Scenes] · Counter-Strike: Global Offensive |
| Day of Defeat series | |
| Left 4 Dead series | |
| Team Fortress series | |
| Other video games | |
| Bundles & Special Editions | |
| Other Hardware & Software | SteamOS · Steam Controller · Steam Controller Carrying Case · Steam Controller Battery Door · Steam Controller Wireless Receiver · Steam Link · Steam Machine |