Aug 2026 Update
Right clicking a card now shows the full effect text, not just a larger card image.
Right clicking a card now shows the full effect text, not just a larger card image.
Quantum Protocol
- Released
- Nov 4, 2020
- Platforms
- Last updated
Updates & announcements
Developer postOriginal post- Developer post
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.
Original postPredator 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.
- Developer post
Bug Fix
Fixed issue where Bow and Katana would not trigger Omen.
Original postFixed issue where Bow and Katana would not trigger Omen.
Developer postChinese 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
Original post-- Correction of card effects and terms
-- Updates to story text to read more naturallyThe updated story text is worth re-reading for veteran players, please give it a try :D
- Developer post
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 issue with Treble and Omen. Treble will now properly proc Omen.
Original postFix 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 issue with Treble and Omen. Treble will now properly proc Omen.
- Developer post
Small Bug Fix
Fixed an infinite combo that could softlock the game with crosscode cards.
Original postFixed an infinite combo that could softlock the game with crosscode cards.
- Developer post
French Localization Added
Added French localization.
Original postAdded French localization.
Developer postNova Drift Collab Arrives!
A new collab deck is here, this time featuring the fantastic space shooter Nova Drift! Many familiar ships and mods take on a new form, reimagined as Quantum Protocol cards. Play mods to mix and match effects onto your ships and discover new combinations every run! Will you go al
Original postA new collab deck is here, this time featuring the fantastic space shooter Nova Drift!
https://store.steampowered.com/app/858210/Nova_Drift/
Many familiar ships and mods take on a new form, reimagined as Quantum Protocol cards. Play mods to mix and match effects onto your ships and discover new combinations every run! Will you go all in with damage? Or balance defensive mods with offensive power? Or maybe focus on setting up the field to drop the almighty Leviathan!!! The choice is yours.
The card art is by none other than the dev of Nova Drift themselves! Chimeric!
But there's more!
Also included in this update is a complete rework of the Spirit archetype!
The Spirit cards have historically been a niche and awkward deck, centered around a strange rhythm of returning cards to your hand. With the rework, they still return to your hand, but they now make use of a much more intuitive mechanic of linking together on the field. There's far too much to explain here, give the deck a try!
Cards
Changed Cockatrice.myth. New summon condition.
Changed Mermaid.myth. New summon condition and effect.Mermaid and Cockatrice have been changed to reward the most unique part of the character that uses them: combining lots of different cards into one deck.
Buffed Octavia.mage. MANUAL effect is now instant.
Buffed Ignis.sorc. Now deals more damage based on a multiplier rather than flat amount.
Buffed Tempus.sorc. Base form is 1 + X, upgrade is 2 x X.Nerfed Spear.blood. Level 1 -> 2. Rarity white -> blue.
Nerfed Spear.blood+. Damage 4 -> 3Level
Reduced the number of bananas in Esper's introduction deck.
Removed a few enemies from Queen's introduction chess level.Special thanks to Nigokos for the art of Aurora.
Also come say hi in the Discord! This decks can get tricky, but the Discord is a great place to get help!
This update has been in the works for a long long while, thank you all for playing! Please consider leaving a review if you haven't already, it really helps me continue working on this game and other games in the future.
- Developer post
Small Patch 7-5-2022
Fix broken Discord link on the title screen.
Original postFix broken Discord link on the title screen.
- Developer post
Localization Update
Updated Chinese text.
Original postUpdated Chinese text.
- Developer post
Chinese Localization Update
Small update to localization.
Original postSmall update to localization.
- Developer post
Chinese Localization Update
Small changes to Chinese text.
Original postSmall changes to Chinese text.
Developer postChinese Language is Here!
Chinese Simplified language is finally here! Also, here's a cute Dragoon with a Dragoon plushie. I think she likes it <3 Drawn by ssrhime Also included are a few small fixes: Cards FIXED Apollo shuffling deck when it should not. If you have not already, please consider leaving
Original postChinese Simplified language is finally here!
Also, here's a cute Dragoon with a Dragoon plushie. I think she likes it <3
Drawn by ssrhime
Also included are a few small fixes:
Cards
FIXED Apollo shuffling deck when it should not.If you have not already, please consider leaving a review! They really help small games like this.
Also come say hi in the Discord! This game is pretty hard, but the Discord is a great place to get started!
Developer postKorean Language Update
Korean language is here! I hope this will allow even more people to enjoy the game :D Also included are a few fixes: Cards FIXED Gunner not applying counters properly at 0 Turn Draw. FIXED Checkmate stacking with itself. System Can no longer pause during transitions, it was break
Original postKorean language is here! I hope this will allow even more people to enjoy the game :D
Also included are a few fixes:
Cards
FIXED Gunner not applying counters properly at 0 Turn Draw.
FIXED Checkmate stacking with itself.System
Can no longer pause during transitions, it was breaking things.
Game should now work better on high DPI screens.And with this update, the girls of Quantum have their splash arts :D collect them all in-game.
If you have not already, please consider leaving a review! They really help small games like this.
Also come say hi in the Discord! This game is pretty hard, but the Discord is a great place to get started!
Developer postVault of the Void Collab Arrives!
A new collab is here! This time for the card game Vault of the Void! Take on dungeons with a brand new playstyle! The deck is fast and aggressive, making use of a super cool combo system inspired by The Hidden from Vault of the Void. The deck is fairly easy to pilot, so give it a
Original postA new collab is here! This time for the card game Vault of the Void!
Take on dungeons with a brand new playstyle! The deck is fast and aggressive, making use of a super cool combo system inspired by The Hidden from Vault of the Void. The deck is fairly easy to pilot, so give it a try! You can find it on the far right side of the level select, grouped with the other collab decks.
As of this update, Vault of the Void is still in Early Access, but having played it a bunch, I can assure you it is well worth playing today and there's plenty of "game" in the game to justify picking it up :D
https://store.steampowered.com/app/1135810?utm_source=collab&utm_campaign=qp
Oh, and Mahou has their red card now, you'll have to beat a new boss after Ascension 4 to get it though. So for all you late-game players out there, there's new stuff!
Now for the regular patch notes:
NEW Collab deck for Vault of the Void
NEW Mahou red card.
NEW Boss level after Ascension 4Cards
Improved keyword descriptions of VOID and CONDITION.
NERFED Kazane, can no longer target itself.
FIXED typos on mahou cards.
ADJUST rarity of Potentia and Lux. Potentia is now green, Lux is now blue.Enemy
NERFED Guillotine. Only triggers on player effects now.
NERFED Zirus. The arms attack slower.
FIXED bug with Venom not doing quite what it said on the text.Game
Ascensions are now shorter. The last sector specifically is much shorter.
Thanks for playing! And please consider leaving a review, it really helps a lot! <3
Be sure to check out the Discord if you have any questions or just want to say hi :D
- Developer post
Localization Update 6-29-2021
Small fixes to Japanese card text.
Original postSmall fixes to Japanese card text.
Developer postMahou Update
The Mahou deck is here! Take control of the magical girls and their powerful companions to take on any threat! This deck is simple to learn but incredibly hard to master, if you're looking for a simple cute deck with a lot of room to learn and grow, Mahou might be for you! I am a
Original postWatch on YouTube The Mahou deck is here! Take control of the magical girls and their powerful companions to take on any threat!
This deck is simple to learn but incredibly hard to master, if you're looking for a simple
cutedeck with a lot of room to learn and grow, Mahou might be for you!I am also super excited to announce that the game is now available in Japanese!!! Select it in the options menu <3
Also added are new rematches with some old bosses, they're pretty tough!
If you haven't yet, please consider leaving a review on Steam. Even if just a few words. It really helps keep the game alive and allows me to make updates like this!
https://store.steampowered.com/recommended/recommendgame/1328530Now for the regular update stuff:
New Stuff
NEW Japanese language support!!!!!
NEW Mahou deck.
NEW rematch with Zarakuri
NEW rematch with Zeaper
NEW gallery picture of magical idol IDOL (get it?! XD)Cards
NERFED Reincarnation. Can no longer target itself.
FIXED Apollo.cross not working vs hand damage.
FIXED Tanzaku.spirit so it works better with multiple copies.
For all 3 of you spirit players out there, this is a bug fix and a buff.FIXED wording of Greed algo. Reads better now.
FIXED Encore ability not working properly with cards that looked for cards in the hand (like Yuki).
This one is too specific to explain here, but basically: Encore works more like you think it does.Enemy
CHANGED Slime boss rematch. It's different. Less janky.
BUFFED Tsukuyomi boss. attack 2->3FIXED White.tlsm to just be ONCE (was ONCE and UNIQUE).
Game
BUFFED emoji in talking scenes. They're bigger :D
CHANGED font. Part of the localization update.
UPDATED card tooltip upgrade bracket location.
Fancy way of saying...you probably wont notice but it bothered me.FIXED bug where ascensions could show cards for decks you do not have unlocked yet.
REMOVED difficulty mode on ascension end level report.
Difficulty mode doesn't work on ascensions, so the end level report has no need to show it.FIXED issue where generic cards would drop far more often than they should.
Oops.REMOVED subtle color difference on next wave radar for higher level enemies.
This was a leftover from long ago, it is not supposed to be here, it was just so subtle and hard to notice that it went unnoticed until now.System
FIXED issue related to online systems causing memory leaks.
Special thanks to nyan komi for the cover image! https://www.instagram.com/nyan.komi/
Consider stopping by the Discord! A lot of these updates come from what we talk about there!
Developer postCrossCode Collab Arrives!
I am super excited to present a new collaboration! CrossCode! Play as the CrossCode characters in card form and enhance their abilities with the four elements: Heat, Cold, Shock, and Wave! CrossCode is an incredible game. For those who have not tried it, I highly recommend! It's
Original postI am super excited to present a new collaboration! CrossCode!
Watch on YouTube Play as the CrossCode characters in card form and enhance their abilities with the four elements: Heat, Cold, Shock, and Wave!
CrossCode is an incredible game. For those who have not tried it, I highly recommend! It's a game with incredible care, attention, and detail in it. Playing it is such a wholesome experience <3
https://store.steampowered.com/app/368340/CrossCode/
Try finding Quantum's characters in CrossCode!
Now to the other changes:
Game
REWORKED Ascension wave spawns. They will now be much more consistent. So fewer easy waves, and fewer crazy hard waves.
NEW puzzle levels! These are optional and unlocked after beating the game. Some of these will prove very tricky and require clever use of different card mechanics.FIXED long card tooltips spilling off the top of the screen.
FIXED soft locks that could be caused by using consumable cards with Reprogram.
FIXED stars not updating when unlocking new decks on level select.Cards
NEW effect flag: CHAINED
This is something that applies to TRIGGER effects and has always been in the game, but now I'm just clarifying it on each card rather than having people guess. TRIGGERS normally resolve in a new chain, but some TRIGGER effects chain directly to the effect that "triggered" them. This difference will now be written on the cards in the form of the CHAINED flag. The difference usually doesn't matter, but sometimes it does :DNEW card: Taser
NEW card: Ambush
NEW card: Rupture
These new generic cards are here to replace ClawTrap and Shatter in the white rarity tier. Read the next few lines to see why.NERF ClawTrap. Rarity white -> green.
NERF Shatter. Rarity white -> green.
Shatter and ClawTrap are old cards, made before there were many other cards to compare them to. Now that there are other cards, the power they provide is way out of line for common cards. Their effects are cool though, so just moving them up to a rarity tier that better reflects their power.BUFF Afterburner. Rarity blue -> white.
NERF Potentia. Max attack buff now 5.
Plz stop stacking attack buffs T.T The bosses get so sad when they don't get to play ; ;
FIX Valeria. Can now select 0 cards for her effect even if there is only 1 spell in the deck.
FIX Valeria. Level 2 -> 3
FIX Camilla. Had issues with infinite loops with cards like Unity. Should no longer happen.NERF Ishida+. Health 6 -> 4.
NERF Chiyo+. Health 5 -> 3.
FIX Saigo card text. Properly specifies it copies the "original" effect.FIX Violette. The details are complicated, but basically, the card should work more consistently now :)
FIX Miki. Now shuffles deck after searching.
FIX Spear blood. Does not need to be ONCE and UNIQUE. Just ONCE is fine since ONCE implies UNIQUE.
ADJUST Greed algo. Now gives you an extra card on turn draw and mills two cards from your deck. Still take damage if there are no cards in the deck.
Algo cards in storage are supposed to be kinda awkward to play, but Greed's old storage effect was way too awkward compared to the other algos, this change is trying to bring it more in line.UPDATE Serenity image. Yay pretty!
ADJUST Serenity. Now uses its own special counters rather than generic counters.
The new CrossCode deck has LOTS of ways to manipulate counters and move them onto Serenity. This is busted. Serenity no longer interacts with normal counters :)
UPDATE Encore image. Yay pretty!
ADJUST Paradox. Delay is no longer a SUSPEND. Delay duration 3->6. Cost increased 5 -> 7.
Suspensions are broken, especially since Omega has so many instant effects and can charge the special so quickly. The longer delay should prove more powerful in the wholesome use cases <3Enemy
ADJUST Daggers. Now starts at 1 atk and increases up to 3 for every card played.
Daggers is THE defining card of ascensions. While they have a lot of counter play, it also feels terrible to be locked down by two of these things. This change should hopefully open up more options for counter play without taking away too much from the power of the enemy.
FIX Miasma. Now properly highlights targets.REMOVED MirrorShard from Ascension waves.
FIX Decima card text. Now properly words "equal to or greater than" condition.
ADJUST BitCache. No longer can give red cards.
Restarting a level to look for a red is not super fun. The red cards are not supposed to be required for any deck to win and should just be a cool random thing that sometimes happens but cannot be explicitly planned around.
FIX Zirus defense effect. Will work more consistently with multi hits.Level
Dragoon's Comet level now has Zlime as the second boss rather than Zeaper.
Just trying to smooth out comet runs and make them a bit shorter. The multiple bosses is important, because it creates stakes in terms of time investment, which encourages thoughtful play rather than attrition. Yes, it feels terrible to lose an hour long run and have nothing to show, I feel that too. But levels like the comet push the game to where I think it shines the brightest, when every action matters, and you find a way to make any cards you get work and discover new interactions. That said, I love compromising, so getting rid of Zeaper's one-shot from the comet should make things more kind <3Story
Very small update to the Omega boss fight text.
Very small change in Omega's postgame scene. Queen generally should not refer to Omega as "Omega," but rather his real name, "Kyril."Consider stopping by the Discord! A lot of these updates come from what we talk about there!
- Developer post
March Update
Some quality of life changes and an update to the spirit deck! Cards Major update to spirit cards! The basic cards are the same, the higher rarity cards have all been adjusted to be more flexible. The changes are kinda long...but check them out in-game, the deck should feel notic
Original postSome quality of life changes and an update to the spirit deck!
Cards
Major update to spirit cards! The basic cards are the same, the higher rarity cards have all been adjusted to be more flexible. The changes are kinda long...but check them out in-game, the deck should feel noticeably nicer to play and generally more powerful as a result.
Nerfed Gunner.eden Now needs to deal damage multiple times to lower turn draw countdown.
Adjusted level of Ragnarok, Crossfire, and BowSnipe. They are now the level you think they should be.Enemies
Dark bosses generally buffed.
All Dark bosses act 1 turn faster. (The previous change to wave threat meant all enemies act 1 turn slower, this change will make dark bosses more interactive, since many dark bosses rely on layering their actions quickly).
Remi 45hp -> 55hp
Griffin now starts with an extra minion card.
Lorado 80hp -> 95hp
Persephone attack 1 -> 2
Demeter 55hp -> 65hp
Demeter thorn enemies now have more health, but Demeter's counters are reduced from 5 -> 3
Kobo 50hp -> 55hp. Now starts with a lantern instead of a katana.
Decima spawns with extra minions.Game
Fixed issue where upgrading multiple cards could result in health going below 0.
Reduced wave threat penalty, 50% -> 25% health
Dealing 0 damage will now prevent wave threat from increasing.
Minimum enemy action time is now 2 (up from 1)Can now view the board when game over.
Can skip death animation by clicking.
Can now close level select panel by pressing ESC.
Pausing now disabled while game is resolving actions. Quitting the game at bad times was resulting in crashes.Options for VSync and FPS limit.
Developer postEden Update
The One Step from Eden collab is here! A brand new deck arrives with iconic characters and some strangely familiar game mechanics. This is one of the fastest and most fluid decks to date (just like the game they're from)! Try it out! Also! Queen is now in One Step from Eden! Chec
Original postWatch on YouTube The One Step from Eden collab is here! A brand new deck arrives with iconic characters and some strangely familiar game mechanics. This is one of the fastest and most fluid decks to date (just like the game they're from)! Try it out!
Also! Queen is now in One Step from Eden! Check her out, she looks super cool!!!
https://store.steampowered.com/app/960690/One_Step_From_Eden/
There's also a bunch of other regular updates!
Big Change: Wave Alert
Wave Alert is now Wave Threat.- Wave Threat increases every turn, and is decreased by dealing damage to enemies.
- If Wave Threat reaches max, you lose half your health.
- Enemies act faster at higher Wave Threat levels.
Stalling is very optimal but not that interesting to play. This upgrade to the Wave Alert system will force players to deal damage at a steady rate throughout the level. Hopefully the new system is not too punishing for players who are already struggling, but if it is, the difficulty settings are more accessible now.
Game
New art gallery and unlockable art.
New difficulty options on operator select.
Removed turn handicap options (replaced by operator select difficulty options)Fixed passives will now properly pulse when their effect is triggered.
Added error effect when trying to play a card with a condition that has not been met.
Changed loot capacity for green and blue loot increased by 1.
Nerfed number of rerolls in ascensions for secondary archetypes reduced 2 -> 1 (primary rerolls unchanged)
Nerfed Dragoon's Comet stage, it is now shorter and has more loot caches.Cards
Added new card. Afterburner!
Added icons for physical and magic damage.Removed healing effects from enemy cards (to work better with Wave Threat)
Nerfed Zirus boss. Arm health reduced. Spike attack reduced.Changed Tanzaku.spirit now force activates the leftmost manual effects on cards.
Fixed Tanzaku.spirt bug where ONCE effects were not properly being activated when multiple Tanzakus were on the field.Localization
Added support for Korean characters
Added card effect flags to localization files.Was super fun working on this collab! One Step from Eden is such a fun game (even if I'm pretty bad at it), was really happy when the dev ok'd all of this! Also! Queen looks super awesome in One Step from Eden, and the Eden cards in Quantum ended up really unique and interesting. It was cool to see how well the characters translated to Quantum. I hope you all enjoy the new deck! And as always, feel free to leave any feedback in the game's Discord, I'm not scary I promise UwU