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I can add The Ship Complete (tradable) and free keys like Supreme Commander Gold, Lucid, Faerie Solitaire.
(I also have some other small games that I would really like to activate myself, if you don't want The Ship.)
EDIT: Or Deus Ex: Human Revolution (+ The Ship Complete) for Hitman Collection + Blur (+ Mirror's Edge). =D
anything here http://www.steamtrades.com/trade/Isaty/h-bemine-2-killing-floor-titan-attacks-x2-more-w-anything-i-dont-have for SMR
not interested in Dota 2