Steam essentials

1. Half-Life 2Half-Life 2https://giantbomb.com/wiki/Games/Half_Life_2Opens wiki page

This came with Orange Box. If you've already bought this. You don't have to worry about it.

2. Source EngineSource Enginehttps://giantbomb.com/wiki/Concepts/Source_EngineOpens wiki page

Use this if you wanna make some games. It's free.

3. The Orange BoxThe Orange Boxhttps://giantbomb.com/wiki/Games/The_Orange_BoxOpens wiki page

All in one package. You'll never sleep

4. Portal 2Portal 2https://giantbomb.com/wiki/Games/Portal_2Opens wiki page

5. BioShockBioShockhttps://giantbomb.com/wiki/Games/BioShockOpens wiki page

Spooky and immersive

6. Deus ExDeus Exhttps://giantbomb.com/wiki/Games/Deus_ExOpens wiki page

What shame to avoid this game

7. Team Fortress 2Team Fortress 2https://giantbomb.com/wiki/Games/Team_Fortress_2Opens wiki page

8. Call of Duty 4: Modern WarfareCall of Duty 4: Modern Warfarehttps://giantbomb.com/wiki/Games/Call_of_Duty_4_Modern_WarfareOpens wiki page

Said to be the greatest in the series by many.

9. Fallout 3Fallout 3https://giantbomb.com/wiki/Games/Fallout_3Opens wiki page

10. Fallout: New VegasFallout: New Vegashttps://giantbomb.com/wiki/Games/Fallout_New_VegasOpens wiki page