Activity briefingAI summary of recorded signals
SteamWatch briefing

Preparing a concise update from the latest recorded activity.

Steam player data · App 4084120

CODEX MORTIS

View on Steam ↗Updated 24 Sept · 21:30 UTC
  • Single-player
  • Multi-player
  • Co-op
  • Online Co-op
  • Shared/Split Screen Co-op
  • Shared/Split Screen
  • Steam Achievements
  • Full controller support
Steam

Store data

UK price
£2.37
US price
$2.79
Positive reviews
78%
Total reviews
66
Release date
24 September 2026
Concurrent players27Most recent successful sample
Today's peak3910/144 samples
Tracked peak39Highest retained daily peak
Steam rating78%66 reviews
Steam metadata

Game information

Details supplied by the Steam store
App ID
4084120
App type
Game
Developer
Supported systems
Windows · Linux
Genres
Action, Indie, RPG
Release date
24 September 2026
Last player update
24 Sept · 21:30 UTC
Steam store data

System requirements

Supplied by the developer on Steam

Windows

Minimum
Requirement
Requires a 64-bit processor and operating system
OS
Windows 11
Processor
Intel Core i3-2100 / AMD FX-4300
Memory
4 GB RAM
Graphics
NVIDIA GeForce GTX 650 / AMD Radeon HD 7750 / Intel HD Graphics 4000 / 1 GB VRAM
Storage
140 MB available space
Sound Card
Any
Recommended
Requirement
Requires a 64-bit processor and operating system

Linux

Minimum
OS
Ubuntu 20.04+ / SteamOS 3.0+
Processor
Intel Core i3 / AMD Ryzen 3
Memory
4 GB RAM
Graphics
Vulkan 1.1 compatible GPU
Storage
140 MB available space
Sound Card
Any compatible sound card
Additional Notes
Native Linux build

Launch window

Released 24 September 2026 · Tracking from 24 September 2026

SteamWatch’s first observed day and week; tracking can begin after release. Top Sellers is Steam’s revenue ranking, not a sales estimate.

First observed dayIn progress
Player peak
39
Steam reviews
Not recordedRating not recorded
Twitch peak
Not recorded
Price observed
£2.37
Top Sellers
No appearanceNo ranked days

1 player-data day recorded in this window.

First observed weekIn progress
Player peak
39
Steam reviews
Not recordedRating not recorded
Twitch peak
Not recorded
Price observed
£2.37
Top Sellers
No appearanceNo ranked days

1 player-data day recorded in this window.

Explore charts ↓
Player history

Concurrent players

Peak 39Average 34Latest 28
01020293924 Sept 2026, 20:00 UTC24 Sept 2026, 21:00 UTC

24-hour and 7-day views use hourly peaks from ten-minute samples. Longer views use retained daily peaks. Up to 24 recent event markers are shown per layer.

Twitch

Twitch stats

Awaiting the first Twitch sample.
Long-term history

Monthly players breakdown

Calculated from SteamWatch samples
MonthPeakGain% gainAverageAvg % gain
Last 30 days39——31—
September 202639——31—
Explore game activity ↓
About this game

Description

Supplied by the Steam store

Codex Mortis is an isometric horde-survivor bullet hell whose roguelite loop runs on a spell deckbuilder. You play a necromancer. Before every mission you assemble a deck from the spells you own, then carry it into a battlefield filled with the undead, alone, with a friend in a local co-op, or online in a party of up to four. You spend the points you earn during a run on booster packs, each pack adds new spells to your collection, and those spells open builds you could not have assembled before.

BUILD YOUR DECK, OPEN YOUR PACKS

Plan before you slaughter, because once the mission starts you fight with what you brought. Before every mission you assemble your loadout from the spells you own, and that loadout is your deck. A deck weighted toward Summoning wins the field by crowding it, with skeletons soaking the horde while you cast. A deck weighted toward Blood Magic hits harder and sacrifices your life to do it.

The points you earn on a run buy booster packs, and every pack adds spells to your collection, so your next deck comes out of a wider pool.

TWIST YOUR SPELLS WITH MUTATIONS

Mutations sit on top of the skills you carry and change the way they work. A mutation riding your bone spear sends it out in a pattern you have to learn again, and one on a summon calls up another archetype of undead. Others reshape the ground an area spell covers or give an aura a character of its own, so a spell you have cast a hundred times comes out of your hands changed.

TEN SCHOOLS OF DARK MAGIC

Every spell in your collection belongs to one of the ten schools of dark magic. There are 200 spells in all, and every school combines with every other.

Necromancy: bone spears, corpse explosions and skeletal prisons.

Summoning: raise undead armies and bone golems.

Blood Magic: sacrifice life for power.

Soul Magic: harvest essence, phase through enemies.

Curses: break enemy will, spread terror and confusion.

Harvest: cull the horde with the scythe.

Death Knight: close-quarters swordplay, spectral armor and war cries.

Spiritism: forbidden rites, spirit turrets and sacrificial urns.

Desolation: sand shades and zones that punish the living.

Apothecary: dark alchemy, elixirs and blight.

31 PLAYABLE HEROES

Many heroes are built around two or three schools at once. Ravena Bloodscythe pairs Blood Magic with Harvest, and Seraphon Wraithblade blends Harvest, Death Knight and Soul Magic.

FOURTEEN LEVELS, 3 GAME MODES

Find perfect builds for fourteen levels: Forgotten Graveyard, Sand Tomb, Cursed Catacombs, Bone Cathedral, Void Sanctum, Soul Nexus, The Throne Room, North Pole, The Overgrown Grave, Chapel of Perpetual Bloom, The Garden of Returned Flesh, The Golden Rot, The First Mercy and The Road to Blood Bath.

The last six levels belong to the Apocrypha, the second chapter of the story campaign. The final four can also be played in Survivor mode, and The Road to Blood Bath ends in a three-phase boss with 600,000 HP.

ONLINE CO-OP FOR UP TO FOUR PLAYERS

Host a game over Steam or join one of the sessions your friends have open. Lock the lobby with a password, or share its code with the people you want in. If a player crashes or drops mid-run, they can rejoin the game in progress while the rest of the party keeps playing. Local co-op works too.

INFINITE BUILD VARIETY

Mix active spells across magic schools for unique combinations

Command Heroes with their own abilities (or play co-op with friends!)

Equip Artifacts that grant powerful bonuses

Deep progression - upgrade damage, cooldowns, health, speed, and more

Open card packs for new spells

Procedurally generated worlds - every run is different

Steam gallery

Screenshots

9 available
More game data · Seller history