Quantum Protocol on Steam - User reviews, Price & Information

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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!

Quantum Protocol is a anime, deckbuilding and card game game developed and published by Kaio Meris.
Released on November 04th 2020 is available only on Windows in 5 languages: English, Japanese, Korean, Simplified Chinese and French.

It has received 617 reviews of which 561 were positive and 56 were negative resulting in a rating of 8.5 out of 10. 😎

The game is currently priced at 12.79€ on Steam.

The Steam community has classified Quantum Protocol into these genres:

Anime Deckbuilding Card Game Visual Novel Class-Based Turn-Based Tactics Turn-Based Strategy PvE Rogue-lite Sci-fi Comedy Singleplayer Fantasy Hacking Logic Strategy Puzzle Cute Difficult

Media & Screenshots

Get an in-depth look at Quantum Protocol through various videos and screenshots.

System requirements

These are the minimum specifications needed to play the game. For the best experience, we recommend that you verify them.

Windows

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

User reviews & Ratings

Explore reviews from Steam users sharing their experiences and what they love about the game.

March 2025

This is the most tactical game I've ever played, hands down. Its the dark souls of roguelike deck builders. The different decks all have extremely fun and well thought out synergies and the endgame is gruelingly difficult, but fair. Very git gud. You have to plan all your moves very carefully and think many steps ahead if you want to clear the later ascensions or the optional bosses. If you want an extremely deep, challenging and incredibly well thought out deckbuilder, you should buy it. Although, I do have to say it's not so much a deckbuilder as a deck-piloter. All the decks are just giant piles of synergy, there's not really different builds for each deck like Slay the Spite etc. There are still choices to make, and there is one character / deck that's specifically designed around open-ended deckbuilding with the entire cardpool. There is around a dozen decks that all play very, very differently though. It's a great game, it's criminal that it's not more widely known.

March 2025

While playing through the story I kept thinking "wow this would be a cool game if it was a roguelike" And then I got to the roguelike part Great game if you are, like me, a masochist and like torturing yourself with stupidly difficult games Oh also there's a story too I guess and like it's fine? I don't know if it's due to translation or what but the writing isn't exactly great. But it's also bad in like, a funny way that was stockholmed me into liking it 10/10 because Idol

Nov. 2024

Bought this game on sale thinking it would be fun to play around with for a couple of hours... here I am, over 100 hours later and I LOVE IT! The first thing I will say is, this game will not be for everybody. But personally, I love it so much that it has earned its place as one of my most favourite games. -Story- Perfect for what the game is, in my opinion. There's enough to introduce you to the characters and keep you interested enough to play through what feels like the rather extended tutorial levels. At the same time, it doesn't drag out unnecessarily, allowing you to enjoy playing the game. Would I have objected to reading more about the characters and world they live in? Absolutely not. But to sum it up, this game should NOT be treated as a visual novel with a bit of gameplay. The gameplay is where this game really shines for those with enough patience and interest in it to learn about the different decks, which I will cover in my next point. -Gameplay- Easily overwhelming when starting out. If you can push through the multiple puzzle like levels that serve to introduce you to new decks and their abilities, then you can really start to have some fun building your own decks. I personally thought the introductory levels were good, as it forced you to try different decks and see which one you might like better, but I will concede that the ascension levels once you get to the end are still where you really start to get some satisfaction from playing. At that point, you start to get a real choice about how you want to play and you can really experiment with the finer arts of each deck. It's so satisfying to finally go 'I get it. I finally understand how this deck that I thought was hard can actually be really strong.'. There were many of those moments for me, which was great! It's always felt like there's something more I can learn and explore, even after playing for hours. -Difficulty- Adding on to my comments on gameplay, there are options to make the game easier if you're really struggling, which you can change at any time (with the exception of certain 'puzzle levels' that require you to do a very particular sequence of actions). The hardest or intended difficulty, whichever way you want to look at it, is by no means impossible and makes the game so much more satisfying to beat. In my opinion at least, but maybe I just enjoy getting my backside handed to me. -Music- Brilliant! One of my favourite parts of the game and really adds to it in a meaningful way. Playing a level or two just to vibe to the soundtrack? Yeah, that was me. -Art- No complaints there from me. As an observation, the character portraits don't change expression like they do in some visual novels, merely serving to show you who's talking at any given moment. They do, however, use styled emojis in chat to convey emotion at times. In conclusion, I could not recommend this game enough for those who love a challenge. Engaging, beautiful, difficult, an absolute blast! 9.9/10

July 2024

Story is very simple, game is pretty hard but can be played in easier modes, probably beat the story in 8 hours. Loved the art and the gameplay. Really solid deckbuilder, highly recommend!

April 2024

It is not a game for everyone, it is a deckbuilding/visual novel/puzzle game. When I played it I was really hooked, it is difficult to understand all the mechanics that the game has but if you soak in the game you will understand it. The game puts you through each puzzle and when the story is over it lets you go to free levels with the deck you want to build by overcoming the challenges.

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Additionally, we incorporate data from the SteamSpy API, which offers insights into game sales and player statistics. This helps us present a comprehensive view of each game's popularity and performance within the gaming community.

Last Updates

Steam data	08 April 2025 20:09
SteamSpy data	07 April 2025 08:21
Steam price	15 April 2025 04:36
Steam reviews	13 April 2025 13:49

If you'd like to dive deeper into the details about Quantum Protocol, we invite you to check out a few dedicated websites that offer extensive information and insights. These platforms provide valuable data, analysis, and user-generated reports to enhance your understanding of the game and its performance.

SteamDB - A comprehensive database of everything on Steam about Quantum Protocol
SteamCharts - Analysis of Quantum Protocol concurrent players on Steam
ProtonDB - Crowdsourced reports on Linux and Steam Deck Quantum Protocol compatibility

12.79€

8.5

561

Online players

Developer

Kaio Meris

Publisher

Kaio Meris

Release 04 Nov 2020

Platforms