A Ground Zero Steam Key — also known as a CD Key or digital code — is the official activation code you redeem on Steam and keep in your library permanently. From €8.39 (-53%) at Difmark, Steam Account format · Cheapest official key: €13.19, 27% below the €17.99 Steam price · 9 verified stores, 9 offers in stock · Updated 01h 21min ago.
Ground Zero for PC starts at €8.39 at Difmark, 53% under the €17.99 of the official store — but that is a shared account, not a key of your own. If you want a key tied to your own account, the cheapest is €13.19 at Kinguin.
That €8.39 already includes the Gocdkeys coupon, so apply it at checkout or the store will show you a higher price.
Just 9 stores stock it, 9 offers in all, so there is little here to push the price either way.
That puts it 33% under its €12.47 average of the last 5 months, so today is a better entry point than most.
That €13.19 key is expensive for what it usually costs.
Worked out from 1,010 daily records of the Steam Key for Ground Zero across 10 stores. See the full price history.
The price does not include each store's payment fees. The percentage is measured on the store price, without coupons, because that is how we record the history. The analysis only counts Key offers. Shared accounts, Steam Gift and physical editions stay out, because they are not the same product and their prices move differently.
With the shared account at Difmark you log into an account that already owns the game: it is the cheapest route, but it never becomes yours and the seller keeps the credentials. If they ever lose or change them, you lose access.
The key at Kinguin costs €4.80 more, but you redeem it on your own account and the game stays there for good. That is the difference between renting and buying.
All 9 offers are Global, so the code redeems on any account no matter where it was created.
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