Open Annihilation

New in 0.7.2Simplified Chinese, Unicode chat and zoom to the whole map

Total Annihilation,ready for the next 30 years.

A free, open source engine that plays the original 1997 Total Annihilation natively on macOS, Windows, Linux, iPhone, iPad and Steam Deck, from your own copy of the game.

Downloadv0.7.2 · every platform Join the DiscordMeet the community Watch the trailer

Free and open source under the GPLv3. Requires Total Annihilation from Steam or GOG, or the free 1997 demo. All platforms

OPEN ANNIHILATION

Every platform you play, at your command.

Also: the launch gameplay video

Annihilate: however. Download Open Annihilation

Pick your platform. We've already guessed.

Android

Apple Vision Pro

DOS

Open Annihilation 0.7.2 · Windows2026-10-06

Install guide

64-bit Windows 7 to 11 Recommended

For most PCs.

open-annihilation-v0.7.2-windows-x64.zip

Download 15.9 MB

32-bit Windows, XP SP3 and later Recommended

Pentium III, Athlon XP or newer. Runs on 64-bit Windows too.

open-annihilation-v0.7.2-windows-x86.zip

Download 16.3 MB

Windows 11 on ARM RecommendedExperimental

For Snapdragon and other ARM PCs.

open-annihilation-v0.7.2-windows-arm64-experimental.zip

Download 14.9 MB

Not sure? The 32-bit package runs everywhere. Unzip it and start open-annihilation.exe from the folder, never from inside the zip.

Windows install guideStep by step, with pictures: install it, add your copy of the game, and the first start.Open the guide →

Install guides for every platform

1
Download the engine
15 to 23 MB. No game content inside.
2
Get the game data
Total Annihilation with the 3.1 update, from GOG or Steam, both expansions included. Or try the free 1997 demo first.
GOG Steam Free demo
3
Point it at your game
On first start, choose the folder that holds totala1.hpi. On Linux and Steam Deck, Steam, Heroic and Lutris installs are found automatically.

All releases and release notes Build from source

Annihilate: whenever. Hardware requirements

From a 256 MB Pentium III to an 8K display.

Minimum specs

256MB minimum

MinimumSoftware renderer

Processor: One core, Pentium III or Athlon XP class
Memory: 256 MB
Graphics: Not required: the processor draws every frame
Display: 640 × 480
Systems: Windows XP SP3 (32-bit), Linux with glibc 2.28, Raspberry Pi 2

Full hardware accelerationRecommended

Memory: 2 GB or more
Graphics: Any graphics card that passes the engine's start-up self-test; it falls back on its own if one doesn't
Processor: More cores help: battles are drawn across spare cores
You get: The whole battlefield on the graphics card, anti-aliasing up to 16×, zoom out to the whole map, up to 120 fps, up to 8K, native Retina density

Every setup

Game data: Total Annihilation with the 3.1 update, about 1.1 GB with both expansions and the music
Download: 15 to 23 MB for the engine
Multiplayer: UDP 47624, TCP 2300–2400 and UDP 2350–2400 open between players

Supported systems

macOS
macOS 11 Big Sur or later · Intel and Apple silicon · signed and notarized
Windows
Windows XP SP3 to Windows 11 · 64-bit and 32-bit · ARM64 experimental
Linux
glibc 2.28+ (Debian 10, Ubuntu 20.04, Fedora 29, RHEL 8) · x86-64 and ARM64; ARMv7 needs glibc 2.36 · X11, Wayland or the console
iPhone & iPad
iOS and iPadOS 15+ · built on your own Mac with Xcode 26 · about 2 GB free
Raspberry Pi
Pi 2, 3, 4, 400 and 5 · Raspberry Pi OS Bookworm or later
Steam Deck
LCD and OLED · Game Mode, from the Linux x86-64 package · experimental

Annihilate: together

Multiplayer enabled
Demo recording & playback
Crossplay with the original

Host or join over TCP/IP from the battle room. The engine speaks the original network protocol, so it plays alongside unmodified 3.1c. Core Prime, the rebuilt Boneyards, launches soon.

Annihilate: whatever

Mods & mutations
Library of mods
Open standards

A mod states how it differs from 3.1c in one OAMOD profile, choosing from 90 standard hacks. Double-click a .oamod to install it, and switch mods without restarting.

Annihilate: wherever

English
Deutsch
Français
Italiano
Español
中简体中文

English, French, Italian, German and Spanish from the game's own data, plus Simplified Chinese with system input methods and Unicode chat between players.