Valve is a game developing company that makes games like Portal, Half Life, and Left 4 Dead.
- None of Valve's series has had more than 2 games.
- The only exception is Half Life, which is in development for a third game.
- Portal and Dota 2 are Valve's only non-Mature rated games.
- Dota, however, is not completely made by Valve, like Counter Strike and Day of Defeat.
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