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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.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via SteamSpy as of 2026-05-13.
“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“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“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 playedLatest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
【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.
【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
[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
[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
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
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-13.
| Player tags | Roguelike Deckbuilder · Card Game · Card Battler · Deckbuilding · Rogue-like · Turn-Based Combat · Tactical RPG · Anime · Strategy RPG · Story Rich · Female Protagonist · 2D (SteamSpy community voting) |
| Features | Single-player · Steam Cloud · Family Sharing |
| Languages | English, Simplified Chinese * , Traditional Chinese * , Japanese * * |
| Achievements | 26 |
| Estimated owners | 20,000 – 50,000 (SteamSpy) |
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