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Metro 2033, death to spies, real warfare 1242, darwinia, multiwinia, two worlds II? :D
kings bounty platinum edition, men of war: vietnam spec. edition, star wars jedi knight 2: jedi outcast, one for HL2?
i can do magicka tradeable for half life 2 :), or keys: red faction armageddon or warhammer 40000 DOW goty
all are tradeable