Steam app 4084120 · updated 12 Sep 2026, 23:23 UTC
A survivors-like deckbuilder with mutating spells and five schools of dark magic. Build devastating combos, battle through ten cursed levels, and spend earned points on booster packs. Survive the isometric bullet hell solo or in local co-op.
25 hourly samples, with the daily peak drawn over them. Weekends are shaded.
7 months, March 2026 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
25 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
12 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
3 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
CODEX MORTIS was released on 26 Mar, 2026.
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92 achievements in total.
50 developer announcements, Dec 2025 to Sep 2026 · times in UTC
Hi Necromancers! This is the last Early Access update for Codex Mortis. It is live today, and the full 1.0 release follows on September 24, 2026 at 10:00 AM PST. We prepared a short teaser that shows both changes in motion. Watch it below…
AlexHi Necromancers! Full release is getting close, so if you have been waiting to pick up Codex Mortis, we started a 20% off sale today.What is coming in the full release:Every map is isometric nowWe are adding more heroesMore skills, so there…
AlexHi Necromancers! If you want to help us making final polishes before full release, we kindly invite you to join our Discord server and visit #join-beta-codex-mortis.It is not the stable branch, so expect bugs and balance moving around. Here…
AlexHi Necromancers! Right, time for a proper catch up. We have been quiet for a bit and there is a good reason for that, because we are getting the game ready for full release and a lot of things got torn apart and put back together in the…
AlexHello Necromancers!To celebrate Summer Sale, Codex Mortis is 20% off right now! COMING AT FULL RELEASEFull Release is fast approaching, so let’s see what you can expect in the full version of Codex Mortis:STORY MODE, revitalized - updating…
AlexHi everyone,We’re happy to announce that Codex Mortis is taking part in Bullet Hell Fest! It's a great time to join the fun as we’ve just added to new story levels, and more are coming soon :) Apocrypha The Chapel Of Perpetual Bloom
AlexHi everyone, A new level is now live ːsteamhappyːEnter the The Chapel Of Perpetual Bloom. Where death finds no rest, the garden devours stone.What to expectThe Blooming meter - cull Rebirth Seeds to drive the meter up; every seed that…
AlexHi guys! A new story mode begins: Apocrypha. The first chapter is out now in this update.The Overgrown Grave - a cemetery from the age when Life returned to the world… and then began to rot.This is not a dead graveyard. It's a place where…
AlexHi everyone!This is the biggest content drop since launch. Two big systems, hundreds of new ways to break the game. Patch is live now, and to celebrate - Codex Mortis is 20% OFF on Steam!Before we dive in - here's short trailer showcasing…
AlexHi Everyone,Quick look at what's brewing in the crypt:Spell Mutators — we're building a system that lets spells fundamentally change behavior mid-run. Not just bigger numbers — new patterns, new triggers, weird side effects. Same starter…
alata_cfHi everyone, Gargoyle Guardians marks the last new spell for a while. We want to shift focus to polishing the upgrade system, adding more meaningful variety between runes, and experimenting with spell mutators. This is the kind of work that…
AlexHi everyone, New update! Let's dive in :) Minion AnimationsAll minions in the game now have proper animations.New Spell: Rotbanner Herald (+ 6 Synergies)A tanky standard-bearer from the Summoning school whose rotten banner poisons the air…
AlexHi everyone, CODEX MORTIS is in Early Access. Your feedback shapes the game directly. If something is not working for you, please share it on the Steam forums or our Discord - it helps far more than a negative review and we read and respond…
AlexBug Fixes Level-up golden wave particles are visible again. A skipped system registration caused the entire particle system update to never run, which silently broke level-up VFX, allowed "zombie" particles to accumulate, and suppressed…
CRUNCHNEW DIFFICULTY: MORTIS The ultimate challenge for Mortis Mastery veterans has arrived. Beyond Apocalypse lies a tier that scales infinitely with your power. What is Mortis? A brand-new difficulty tier (Tier 8) that breaks the traditional…
CRUNCHHi everyone,Two new spells for y'all :) New Spell: Grave Tumor (+ 7 Synergies)Lob a massive necrotic mass that crushes all enemies in its path as it slowly rolls toward a random foe. Pierces unlimited enemies with its heavy, slow-moving…
AlexHi everyone, We're back with another update :) Two new spells and global Mortis Mastery Level ranking!New Spell: Blood Lance (+ 7 Synergies)A crimson lance hurled at the nearest enemy. Instead of firing volleys like Bone Spear, it pierces…
AlexHi everyone, Endgame meta-progression is here. As always, your feedback shapes the game directly. If something is not working for you, please share it on the Steam forums or our Discord - it helps far more than a negative review and we read…
AlexHi everyone!!CODEX MORTIS is now officially Steam Deck Verified - the game is fully playable on Steam Deck out of the box, no tweaks needed. Grab your Deck and take the crypt on the go.- CRUNCHFEST & GROLAF
AlexHi everyone!!CODEX MORTIS is in Early Access. Your feedback shapes the game directly. If something is not working for you, please share it on the Steam forums or our Discord - it helps far more than a negative review and we read and respond…
AlexHi everyone, CODEX MORTIS is in Early Access. Your feedback shapes the game directly. If something is not working for you, please share it on the Steam forums or our Discord - it helps far more than a negative review and we read and respond…
AlexAdventurers, We have been working hard behind the scenes, and today we are thrilled to reveal the biggest content drop since CODEX MORTIS entered Early Access — a brand-new world that takes you back to where it all began. Thank you for…
CRUNCHHi everyone, CODEX MORTIS is in Early Access. Your feedback shapes the game directly. If something is not working for you, please share it on the Steam forums or our Discord - it helps far more than a negative review and we read and respond…
CRUNCHWelcome to Community Update #5! This is our biggest update yet — we’re introducing Survivor Mode, a brand-new way to play CODEX MORTIS that challenges you to push beyond the 15-minute mark. We’ve also added a Spawn Rate Indicator…
CRUNCHWelcome to Community Update #4! This patch introduces two brand-new spells and delivers a balance pass on Bone Spear, along with a small UI fix for Spirit Walk. Read on for the full details. New Spells Tooth Barrage A cone attack that…
CRUNCHThanks to your feedback and our ongoing Early Access development, CODEX MORTIS is evolving fast. Community Update #3 brings two more new spells forged from your suggestions, plus balancing improvements to the Soul Nexus boss gauntlet. The…
CRUNCHTwo new necromancy spells have arrived in CODEX MORTIS — plus a major Bone Cathedral rebalance that should make runs feel significantly smoother. New Spell: Jaw Strike {STEAM_CLAN_IMAGE}/45888986/b2299c5e98f339a438d4e69d25a8a3a1a2c7afca.png…
CRUNCHYour reports from the battlefield have been heard. This hotfix tackles enemy spawning, boss phase transitions, and the JUGGERNAUT's catch-up logic. Here's what's changed:Enemy spawning now uses game-time instead of real-time timers, so…
AlexCrunchfestYour feedback shapes CODEX MORTIS — and this update is proof of that. Community Update #1 brings two of the most-requested features straight from your suggestions, plus a bugfix that's been on our radar. Community Requests Tab key now opens…
CRUNCHThank you for diving into CODEX MORTIS! We've been blown away by the response since our Early Access launch — your feedback has been invaluable. This first hotfix focuses on improving input handling, UI navigation, and overall readability…
CRUNCHHi Necromancers! It’s finally here - your favorite AI slop game - Codex Mortis has just launched in Early Access! Grab it now with a 10% launch discount before AI Antis steal all the copies. Eight different levels await you:Forgotten…
AlexCrunchfestHey, Necromancers!Quick update — we're pushing the Early Access launch by one week, from March 19 to March 26.Nothing horrific. We just need a bit more time to test and polish things before we put the game in your hands. We'd rather take an…
AlexCrunchfestHey, Necromancers! Big news. Codex Mortis is officially part of Steam Next Fest (February 23 – March 2), and we're coming in hot with some major updates to the demo.But first — the one you've been waiting for:Early Access launches March 19…
CRUNCHHey, Necromancers!Quick update — our pre-Early Access beta is entering its final stretch. We're polishing, fixing, and tweaking everything before the big launch, and we need as many hands on deck as possible.Join our BETA TESTS!Playtesting…
AlexCrunchfestHey, Necromancers!We're gearing up to launch Early Access soon, and we couldn't be more hyped. But before that happens — we need your help.We've got levels in various stages of development ready for playtesting right now on our Discord.…
AlexCrunchfestHey necromancers!Codex Mortis Demo is now fully playable on Steam Deck. Grab your Deck and slay your enemies on the go.Cheers,The Codex Mortis Team
AlexCrunchfestHey necromancers!We've been deep in the crypt polishing things up, and today we're excited to share what's new: a complete UI overhaul.See it in action:CHANGELOGUI OverhaulPause Menu - new look matching main menu style with ambient effects…
AlexCrunchfestI made this game as a passion project after my 9-5. I never expected to reach this many players. Games and programming have always been my passion, and I wanted to create something I could truly call my own. And so, with AI, I created Codex…
AlexCrunchfestDEMO BUG FIXES & REBALANCE UPDATEHey necromancers!New patch for DEMO is live with fixes and balance changes - most of them thanks to our amazing Discord beta testers who keep finding bugs and giving us feedback. You're shaping this game…
CRUNCHDEV DIARY #1 - BONE CATHEDRAL & BETA TESTINGHey necromancers!Time for a little peek behind the curtain. Here's what we've been working on for Early Access.The Plan: 8 Levels, 8 Different MechanicsOur vision for Early Access is 8 unique…
CRUNCHMASSIVE OPTIMIZATION UPDATE + some sneak peekWe've been deep in the code and this update is all about performance. The demo should now run smoothly even on a calculator.What changed:Memory management improvementsPerformance…
CRUNCHCodex Mortis DEMO - Build 196 Changelog BalanceNerfed HemorrhageNerfed Lifesteal UI Fixed display of certain parameters in the upgrade UI Bug Fixes Fixed urns continuing to spawn after all heroes have been unlockedFixed artifacts spawning…
Patch notes🎄 XMAS UPDATE IS LIVE! 🎄Ho ho ho, necromancers!We've got a big one for you - a brand new bonus level FOR FREE DEMO, major hero improvements, UI upgrades, skill fixes, and new music. Let's dig in:NEW: XMAS BONUS LEVELHunt down Undead Santa…
CRUNCH🎄 DEMO BETA TEST: XMAS BONUS LEVEL 🎄Ho ho ho, necromancers!We're excited to announce beta testing for a brand new bonus level FOR FREE FOR DEMO - Xmas!What's waiting for you:New monsters and challengesA completely different objective - this…
CRUNCHGreetings, Necromancers! We’ve been refining the demo based on your feedback. Here is what’s new in the latest build:We’ve added a new loot roll bar UI when opening chests.Fixed the "audio cacophony" issues where sound effects would stack…
AlexCrunchfestDEMO OPTIMIZATION, ART, AND BURNING SCREEN BUGBased on your feedback, we've pushed an optimization update - sorry for the performance issues some of you experienced. It should run much better now. We're still working on squeezing out more…
CRUNCHUpdate: Performance & StabilityFixed optimization issues - the demo should run much smoother nowFixed a bug where alt+tabbing would break game controlsLet us know if you're still experiencing any issues!
CRUNCHUpdate: Balance OverhaulWe've been watching influencer playthroughs and reading your feedback - and we've rebuilt a lot of core balance elements: XP gains, enemy count, stats, and more. We also unlocked 4 skill slots from the start and gave…
CRUNCHHello,new update on demo is live!Changelog: Progression OverhaulReduced prices for new skill slotsUnified skill price scalingRemoved skill unlock requirements – no need to own specific skills to unlock othersLevel up now heals your…
CRUNCHHi!We have new update for you:Update NotesEnvironmentDestructible environment – enemies pushing against environmental objects will now destroy themChests no longer have collision after being openedUIChest opening progress bar moved above…
CRUNCHWhat Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | Codex Mortis.exe | windows | ||
| Launch | codexmortis | --no-sandbox | linux |
The folders Steam Cloud syncs. The root is a token Steam uses for a location on your own machine, not a path this page can know.
| Root | Folder | Files |
|---|---|---|
WinAppDataRoaming | codexmortis-full | * and below |
It runs on public data and somebody's spare time.
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG