A Project Thea 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 €10.07 (-50%) at Difmark, Steam Account format · Cheapest official key: €12.07, 40% below the €19.99 Steam price · 4 verified stores, 4 offers in stock · Updated 01h 15min ago.
A dark turn-based strategy-survival RPG blending retro-futuristic urban fantasy with Slavic folklore. Customise your characters’ gender, class, and race, and recruit NPC allies to explore the wastelands, rebuild your colony, and engage in tactical card-based combat. Experience branching narratives and character progression, where every choice shapes your survival and the fate of humanity in this story-rich roguelite adventure.
Survive and Explore a Story-Rich Post-Apocalyptic World. Uncover the secrets of Thea through rich storytelling, engaging quests, and diverse points of interest. Scavenge vital resources and face environmental challenges as you navigate a retro-futuristic wasteland shaped by Slavic folklore and mystical ruins.
Develop Your Hero and Party. Lead as your main hero while assembling a diverse party of NPC allies, each with unique abilities and personalities. Build and customise your team through deck-building mechanics and character progression, tailoring strategies to overcome the wasteland’s many threats.
Overcome Tactical Challenges. Use your card deck to navigate the perils of a shattered world, resolving both combat and non-combat encounters. Battle monstrous foes in tense, turn-based skirmishes or strike dark bargains with cunning Slavic demons. The tactical use of your deck is essential to outwit enemies!
Rebuild and Manage Your Colony. Ensure the survival of your base by recruiting new NPCs for your party, expanding your settlement, and navigating the politics of the town council. Balance growth with survival as you work to revive civilisation in the ruins of humanity.
Custom Hero Creation: Personalise your hero's appearance, choose their class, gender, and tailor their abilities to suit your playstyle.
Branching Story: Every choice changes the story and shapes your future.
Rebuild & Manage: Rebuild your colony and manage resources in a crumbling world.
Survive: Stand against the cruelty of the wastelands and enemies out to get you!
Explore & Gather: Scavenge the land for rare resources and hidden secrets.
Card-Based Combat: Build your deck and fight with tactical, card-driven battles.
Craft & Customise: Craft gear, items, and of course some yummy Slavic foods!
Planned during EA:
Co-op Mode: Team up with a friend for two-player chaos!
Project Thea for PC starts at €10.07 at Difmark, 50% under the €19.99 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 €12.07 at Kinguin.
That €10.07 already includes the Gocdkeys coupon, so apply it at checkout or the store will show you a higher price.
Just 4 stores stock it, 4 offers in all, so there is little here to push the price either way.
That puts it 27% under its average of €13.82 since 2025, so today is a better entry point than most days of its life.
That €12.07 key is at its usual price: no bargain, no spike.
Worked out from 442 daily records of the Steam Key for Project Thea across 4 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 €2.00 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 are Global, so the code redeems on any account no matter where it was created.
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