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two worlds 2 + Shattered Horizon + Iron Grip: Warlord + Ion Assault (all keys) for it
One game key from that list: Awesomenauts, Blacklight: Tango Down, Fable - The Lost Chapters, Hotline Miami, Karateka, Midnight Club 2, Titan Quest Gold
Something from those for Half-Life 2 gift?
Preferable to gifts but if its a good game key then maybe :D