Actually not possible... Sadly. Except you already own the game.
Comment has been collapsed.
Meh... Too bad. Back in the days it used to be like that:
Redeeming key of a game you own: "you already own game xyz " -> install page, key stays unredeemed
Redeeming key you don't own: redeemed
Redeeming already redeemed key: "duplicated key" error
Comment has been collapsed.
with SGTools: http://www.sgtools.info/nonactivated/GoatPimp
Comment has been collapsed.
If you own the game, Steam will say you already own the game.
If you don't own the game, Steam will either activate the game or say it's already been used.
Comment has been collapsed.
As far as I know it can in fact get used up if it's a different AppID. There's lots of stories of people activating a key for a game they already own because of this. Usually though, the key would not get used. It depends on the game.
Comment has been collapsed.
That's not true. The key is only used up if you don't own it
Comment has been collapsed.
No it isn't. It's only used up if it successfully activates; i.e., you don't already own the game.
Edit: Apparently the other 4 people were faster than me, all within a minute. What they said.
Comment has been collapsed.
I'll never know what I missed :'(
This comment was deleted 24 seconds ago.
50 seconds ago
Comment has been collapsed.
This comment, I deleted the reply because it was not for you :)
Comment has been collapsed.
How can i check keys if they were activated without activating them?
Comment has been collapsed.