Half-Life 2 had Steam trading card support added in the initial test batch of trading cards on 15 May 2013. There are 8 cards in the series, and you'll receive 4 cards at random for purchasing and playing the game.
Trading Cards
Foil Cards
Badges
Level 1
City 17
City 17
Level 2
Black Mesa East
Black Mesa East
Level 3
Ravenholm
Ravenholm
Level 4
Resistance
Resistance
Level 5
Nova Prospekt
Nova Prospekt
Foil Badge
Citadel
Citadel
Booster Pack
Emoticons
:alyx:
(Common)
(Common)
:gordon:
(Common)
(Common)
:headcrab:
(Common)
(Common)
:eli:
(Uncommon)
(Uncommon)
:gman:
(Rare)
(Rare)
Profile Backgrounds
Citadel Core
(Common)
(Common)
Combine Technology
(Common)
(Common)
Gordon & Alyx
(Common)
(Common)
Gordon & Alyx 2
(Uncommon)
(Uncommon)
"Rise and shine, Mister Freeman"
(Rare)
(Rare)
