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Theseus Protocol

Theseus Protocol

Theseus Protocol is a deck building roguelike where rebirth offers strategic opportunity. Utilize a powerful suite of cards and weaponry to uncover the cruel truth behind the dystopian sci-fi world of Mark City.

Released Aug 22, 2023 Developer YueTang(Xiamen) Publisher Archive Games Platforms Windows Roguelike DeckbuilderCard GameCard BattlerDeckbuildingRogue-like
View on Steam ↗ $9.99 (US · as of 2026-09-25)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-02 · quoted reviews as of 2026-05-13.

69.6%positive372 reviews

What reviewers agree on

Praised
Criticised
Bar length = how many of the 53 reviews raise the point On criticised points, the pale part = reviewers who still recommend the game Select a point to see the exact counts and what reviewers wrote.

Counted across 53 English reviews, sampled to match this game's 69.6% positive rating · as of 2026-05-13

Recommended · 18 found this helpful

“This game has a lot of depth for what looks like fairly simple card mechanics at the start, and keeps building on it as you go through new runs. My only gripe is leveling up a character and getting upgrades takes quite a while, but thankfully whenever you do get an upgrade for a…”

— a player, Steam review · 14 hrs played
Recommended · 11 found this helpful

“Slay the spire-esque with added mechanics. Seems promising but definitely needs some spellchecking/grammar review in English.”

— a player, Steam review · 2 hrs played
Not recommended · 60 found this helpful

“Right now, I feel like there's way too little and what is there is incredibly unbalanced. There is no way to adjust the difficulty, Nena (the summoner class) doesn't even summon that often due to a lack of cards that can summon, not like that matters anyway because shield spam…”

— a player, Steam review · 4 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-19.

26achievements
5.1%median completion
0.6%rarest: Revelation of Dragons
63.1% of players 31.6% of players 29.3% of players 22.8% of players 21.9% of players 19.7% of players 15.0% of players 14.7% of players 13.0% of players 12.3% of players 8.8% of players 7.9% of players 5.1% of players 5.1% of players 5.0% of players 4.6% of players 2.6% of players 1.8% of players 1.7% of players 1.1% of players 1.1% of players 1.1% of players 1.0% of players 0.9% of players 0.7% of players 0.6% of players 63.1% 0% most earned rarest
Almost everyone has
63.1%Test Passed — Game start!
31.6%Rampaging Intelligence — Defeat Hostage Girl
29.3%LUCY — Defeat Marionette
Rarest badges of honor
0.6%Revelation of Dragons — Get a complete collection of Metal Beasts
0.7%Huh, Trashes — Complete a run without receiving any rewards after battles
0.9%Crimson Comet — Complete a run with a deck of only Attack Cards

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-08-12. Steam prices vary by region — always confirm your local price on Steam.

$9.99current · sampled 2026-09-25 21:36 UTC
$9.99lowest since tracking began2026-08-12
US9.99 USD
EU9.75 EUR
UK8.50 GBP
Australia14.50 AUD
Canada12.99 CAD
Japan1,200 JPY
Brazil32.99 BRL
China42.00 CNY

Regional prices at last sample, in local currency — Steam sets each region's price independently.

China≈$6.3 Brazil Japan Canada US Australia EU UK≈$11

Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.

$0 $10 $20 08-12 08-21 08-30 09-08 09-16 09-25

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Aug 23, 2023
【1.0.10823】2023.8.23 Minor Bug Fixed Announcement

Minor Bug fixed. If you encounter any other problems, please leave a message or join our Discord to provide feedback.

Aug 22, 2023
【1.0 Release】Theseus Protocol is now in version 1.0.

After a period of polishing and optimization, Theseus Accord officially launched its official version on August 22nd. We would like to thank all the players who have been with us since EA. The 1.0 ver

Jul 06, 2023
[Test version 0.9.0707] New game mode, achievement system available.

NOTE: This update will clear players' battle archives (game settings, user archives remain). We expect to update after 8:00 AM PST on the 6th, players should prepare in advance (we recommend playing t

Jun 28, 2023
[Beta Version 0.9.0628] 6.28 Update announcement

Join our discord and share your opinion and feedback! The overall update content is as follows: 1. Added a switch function between playing cards modes and charging modes to facilitate pure touch scree

Jun 21, 2023
2023.6.21【Minor Bug Fixed Announcement】

We have discovered a bug that affects the game progress and saving files after the game update. It has been fixed immediately. We deeply apologize for the inconvenience caused to you! · Fixed the bug

Games like Theseus Protocol

From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-13.

Player tagsRoguelike Deckbuilder · Card Game · Card Battler · Deckbuilding · Rogue-like · Turn-Based Combat · Tactical RPG · Anime · Strategy RPG · Story Rich · Female Protagonist · 2D (SteamSpy community voting)
FeaturesSingle-player · Steam Cloud · Family Sharing
LanguagesEnglish, Simplified Chinese * , Traditional Chinese * , Japanese * *
Achievements26
Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS: Windows 10(64bit) Processor: Dual Core 2 GHz(64bit) Memory: 4 GB RAM Graphics: Intel HD 4600(AMD or NVIDIA equivalent) DirectX: Version 11 Storage: 4 GB available space