Steam – What happens if I activate a product key on Steam for a game I already own

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I have a Steam product key for Just Cause 2 I got for free with the purchase of my video card. However, I already have a copy of this game attached to my Steam account. What will happen if I try to activate this other key on my account? Will Steam give me a copy of Just Cause 2 to gift to somebody else? Will it simply refuse to add it? Or will it eat the key rendering it worthless?

I don't want to try this only to have the latter happen, but it would be useful to be able to add it and gift it to somebody else.

Best Answer

I agree with corroded that you should just give them the key, but to answer your question:

If you purchase a copy of a game you already own, you may or may not receive a giftable copy to give to someone else. According to Valve, the only cases where you get a giftable copy are:

  1. Users who own Left 4 Dead and then go on to purchase "Left 4 Dead + Left 4 Dead 2 Bundle" will receive an extra copy of "Left 4 Dead"

  2. Users who own Half-Life 2 and go on to purchase “The Orange Box” or the "Valve Complete Pack" will receive an extra copy of “Half-Life 2”.

  3. Users who own Half-Life 2: Episode One and then go on to purchase the "Half-Life 2: Episode Pack”, “Valve Complete Pack” or “The Orange Box” will receive an extra copy of “Half-Life 2: Episode One”.

  4. Users who own Dawn of War II and then go on to purchase "Dawn of War II Gold Edition" will receive an extra copy of "Dawn of War II"

  5. Users who purchase the available four packs for specific Steam titles will receive three extra copies of that title to gift to friends.

  6. Extra copies may apply as a part of some limited time promotions. In that case, information on what will be included with your purchase will be listed on the storefront's transaction page.

When trying to activating a Game you already own (or a bundle you already own parts of), Steam will warn you in a popup which game/parts won't be added to your library. You then have the choice to cancel the activation.

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