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Valve Video Games

Valve Corporation, also known as Valve Software, is an American video game developer, publisher, and digital distribution company headquartered in Bellevue, Washington. It is the developer of the software distribution platform Steam and the Half-Life, Counter-Strike, Portal, Day of Defeat, Team Fortress, Left 4 Dead, and Dota series
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avg. score: 5 of 30 (15%)
required scores: 1, 2, 3, 4, 7 
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Half-Life
Half-Life
1
Team Fortress Classic
Team Fortress Classic
2
Half-Life: Opposing Force
Half-Life: Opposing Force
3
Ricochet
Ricochet
4
Counter-Strike
Counter-Strike
5
Deathmatch Classic
Deathmatch Classic
6
Half-Life: Blue Shift
Half-Life: Blue Shift
7
Day of Defeat
Day of Defeat
8
Counter Strike Condition Zero
Counter Strike Condition Zero
9
Counter-Strike: Source
Counter-Strike: Source
10
Half-Life: Source
Half-Life: Source
11
Half-Life 2
Half-Life 2
12
Half-Life 2: Deathmatch
Half-Life 2: Deathmatch
13
Day of Defeat: Source
Day of Defeat: Source
14
Half-Life 2: Lost Coast
Half-Life 2: Lost Coast
15
Half-Life 2: Episode 1
Half-Life 2: Episode 1
16
Garry's Mod
Garry's Mod
17
Half-Life 2: Episode 2
Half-Life 2: Episode 2
18
Portal
Portal
19
Team Fortress 2
Team Fortress 2
20
The Orange Box
The Orange Box
21
Left 4 Dead
Left 4 Dead
22
Left 4 Dead 2
Left 4 Dead 2
23
Alien Swarm
Alien Swarm
24
Portal 2
Portal 2
25
Counter-Strike: Global Offensive
Counter-Strike: Global Offensive
26
Dota 2
Dota 2
27
The Lab
The Lab
28
Artifact
Artifact
29
Half-Life: Alyx
Half-Life: Alyx
30
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