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Quantum Protocol
A deckbuilding card game where it's always your turn. Play as the master hackers of Quantum and take on the most dangerous malware in the world. Every action matters. Make plays, upgrade your deck, and break the enemy board!
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.
“Underrated game. Reasonably fun despite a very lengthy tutorial and "puzzle" section, which then opens to a story mode, which then opens to a roguelike. Very fast and strategic battles. Very well worth a play if you're into card games.”
— a player, Steam review · 22 hrs played“Quantum Protocol is a nice game but really difficult to complete.”
— a player, Steam review · 16 hrs played“从超时空方舟闻名而来的，打完剧情后感觉相比卡牌游戏，其实更像是陷阵之志”
— a player, Steam review · 14 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-05 via SteamCharts.
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.
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.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.
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 2026 Update
Right clicking a card now shows the full effect text, not just a larger card image.
Bug Fix
Predator enemy will now only chase cards if their health is below their base max health (instead of current max health). This matters for cases where HP is modified.
Chinese Translation Update
-- Correction of card effects and terms -- Updates to story text to read more naturally The updated story text is worth re-reading for veteran players, please give it a try :D
Bug Fixes
Fix issue with damage negation. Damage negation will now show properly in the Action Log, and cards like Taser or Vampire effects will behave more intuitively if they have their damage negated. Fix is
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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.
| Genres | Strategy |
| Player tags | Anime · Deckbuilding · Card Game · Visual Novel · Class-Based · Turn-Based Tactics · Turn-Based Strategy · PvE · Rogue-lite · Sci-fi · Singleplayer · Comedy (SteamSpy community voting) |
| Features | Single-player · Steam Achievements · Steam Trading Cards · Steam Cloud · Family Sharing |
| Languages | English, Japanese, Korean, Simplified Chinese, French |
| Achievements | 11 |
| Official site | https://www.kaiomeris.com/quantum |
Minimum system requirements (PC)
Minimum: Requires a 64-bit processor and operating system OS: Windows 10 (64 bit only) Processor: 2.4 GHz Dual Core Memory: 4 GB RAM Graphics: NVIDIA GeForce GTX 460 or AMD Radeon HD 5770 /w 1GB VRAM DirectX: Version 11 Storage: 3 GB available space