Theseus Protocol: Steam price vs key
Theseus Protocol has a regular Steam price of €9.75 and costs €18.35 as a key at BuyCheapKeys (October 4, 2026). Turn on the price alert and we'll tell you when it drops.
- Instant deliveryKey by email and in your account
- Full guaranteeReplacement or refund
- Secure paymentCard, PayPal, Google Pay, Apple Pay
- Activates on SteamSame game in your library
- Up to 4% cashbackWith the VIP Club
Should I buy Theseus Protocol now? Wait for a drop
Turn on the price alert and we'll let you know as soon as the key gets cheaper.
Price score: 0/10 · The key does not beat the regular Steam price.
The same game, for less
A Steam key gives you exactly the same as buying on Steam. Only the price changes.
Available Theseus Protocol keys
1 offer, sorted by price
- €18.35Buy
Theseus Protocol
CheapestSteam keyGlobal
Theseus Protocol price history
- Steam€9.75
- BuyCheapKeys key€18.35
We've been tracking this game since October 3, 2026. The chart will appear once there are a few days of data.
How to activate the Theseus Protocol key
- 1
Buy the key
Choose the Theseus Protocol offer and pay. You get the key instantly.
- 2
Open Steam
Go to “Games” › “Activate a Product on Steam”.
- 3
Redeem and play
Paste the key and the game stays in your library forever.
Theseus Protocol FAQ
›How much is Theseus Protocol on Steam?
The regular Steam price of Theseus Protocol is €9.75. At BuyCheapKeys the Steam key costs €18.35.
›Where to buy Theseus Protocol cheapest?
We track the BuyCheapKeys key price (€18.35) every day. Turn on the alert to know when it drops.
›Is the Theseus Protocol key the same game as on Steam?
Yes. When you redeem the key, Theseus Protocol is added to your Steam account with achievements, cloud saves and updates, just as if you bought it on Steam.
›What is the lowest price for Theseus Protocol at BuyCheapKeys?
The lowest recorded price for the key at BuyCheapKeys is €18.35 (October 4, 2026). Today it costs €18.35.
›Will the Theseus Protocol key work in my country?
We list Global and Europe region keys. Each BuyCheapKeys product page tells you whether it can be activated in your country before you buy.
›Is it safe to buy from BuyCheapKeys?
Yes. Delivery is instant by email and in your account, we accept card, PayPal, Google Pay and Apple Pay, and every purchase is covered by a replacement or refund guarantee.
›Does Theseus Protocol work on Steam Deck?
Valve rates it “Playable” on Steam Deck. Once the key is activated on Steam you can play it on Steam Deck just like on PC.
›Is Theseus Protocol worth it?
It has 65% positive reviews out of 317 on Steam (“Mixed”), was released in 2023 and is developed by YueTang(Xiamen). Genres: Roguelike Deckbuilder, Card Game, Deckbuilding, Card Battler.
Games like Theseus Protocol, cheaper as a key
-67% vs Steam RRPSlay the Spire
-55% vs Steam RRPDungeons & Degenerate Gamblers
-87% vs Steam RRPDecktamer
-78% vs Steam RRPHadean Tactics
-13% vs Steam RRPSpellRogue
-53% vs Steam RRPBreachway
Theseus Protocol
€18.35