An ARC SEED 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 €6.71 (-55%) at Difmark, Steam Account format · Cheapest official key: €14.99 · 3 verified stores, 4 offers in stock · Updated 09h 40min ago.
Choose your Pilot and Mech! Prepare to build your city defenses and manage your equipment.
Face the incoming alien threat, known as Angels, that traveled interstellar space in their seed pods and arrived on Earth bringing death and destruction.
You will need to upgrade your mech, manage your weapons and equipment. Build the perfect deck combination and survive all the incoming Archangels.
You can also build your city defenses and with appropriate funding create the perfect city fortress.
Just don't forget to give enough time for the population to evacuate. Once the buildings are empty, you can use them as part of the offensive, to block incoming attacks or even crush the Angels between buildings.
Key Features:
Equip your Mech: Upgrade your systems, weapons and manage your deck. 3 Mechs available right now!
City Fortress: Buy Artillery, Tanks and even other Mechs to face the incoming threat.
Destruction: Push and pull the buildings, build obstacles, use them as firing cover or even crush the angels between buildings.
Save the Citizens: Make sure the population is evacuated in time, the governments will reward you.
Replay: Even if you fail, there are other cities you can still save, no time to rest!
ARC SEED for PC starts at €6.71 at Difmark, 55% under the €14.99 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 €14.99 at Steam.
That €6.71 already includes the Gocdkeys coupon, so apply it at checkout or the store will show you a higher price.
Supply is thin — 4 offers from 3 stores — and thin supply keeps prices steady rather than falling.
It is €0.22 away from its all-time low (€6.49, back in June 2026).
That €14.99 key is expensive for what it usually costs.
Worked out from 403 daily records of the Steam Key for ARC SEED across 1 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 Steam costs €8.28 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 4 offers redeem on US, so region is not something you have to check on this one.
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