Theseus Protocol

Turn-based roguelike deckbuilder where unused cards become ammunition for weapons

YueTang(Xiamen) · Published by Archive Games · Released Aug 22, 2023

Reviews: Mixed; 66% of 334
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 3 years ago; Aug 23, 2023
Minimum PC: HD 4600; 4 GB RAM · 4 GB disk; Full requirements

What is Theseus Protocol?

This single-player, 2D deckbuilding roguelike takes place in dystopian Mark City, where you try to change humanity’s fate. Across branching runs, you build a deck and reposition during battles to dodge attacks or make enemies collide. Three playable characters have different combat styles and story threads.

For you if...

+you enjoy planning turns around movement and card combinations
+you like uncovering story fragments across repeated runs

Not for you if...

−you want a broad card pool with varied builds
−you prefer real-time action without managing a deck

What players say

66% of 334 reviews are positive

Players praise the anime artwork and weapon upgrades. Recurring complaints concern poor English translation and systems that some players find overly complicated.

Screenshots and trailer

Theseus Protocol system requirements

Minimum: HD 4600, 4 GB RAM, 4 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 10(64bit)
Processor: Dual Core 2 GHz(64bit)
Graphics: Intel HD 4600(AMD or NVIDIA equivalent)
Memory: 4 GB RAM
Storage: 4 GB available space
DirectX: Version 11

Does Theseus Protocol have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Theseus Protocol run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

Some in-game text is small and may be hard to read
All functionality is accessible with the default controller configuration
Shows Steam Deck controller icons
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Achievements: 26
Steam features: Cloud saves, Family Sharing
Languages: Full audio: Simplified Chinese, Traditional Chinese, Japanese. Text only: English.

Does Theseus Protocol use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam