Version 1.50.13

Master of Orion 2 fan patch with the MOO2 Launcher and ICE 21.

Installation FAQ & Changelog

9600 kB; 199 downloads

Patches Overview

1.31 Official Patch

Master of Orion II: Battle at Antares (aka Master of Orion 2, aka MOO2) version 1.1 was released in US and Canada retail stores on November 22, 1996. The first patch, version 1.2, was quicky released to the web three days later. Patch version 1.3 was revealed to the world in March 1997. With it came the release of German, French, Spanish and Italian translations of the game. For the English and German versions, 1.31 patches were released on April 11, 1997. These patches are available in the download section below. As far as I know, no downloadable French patch was released to the web. Thereafter an integrated executable was built for the Spanish and Italian languages (2-in-1) cd-rom which contained a few undocumented bug fixes but still carried the same version number 1.31. Towards the end of the year, a 5-in-1 multilingual cd-rom version became available, again as a version 1.31, bringing these additional bug fixes to the other three languages, but this new version of the executable was never released as a patch.

Version 1.1-1.31 changelog.

1.31 Russian Fan Patch

A Russian language version of the 1.31 patch was made by Grig de Griz during 2006-2007. This version is an add-on to the official 1.31 version and does not replace any original game files. To play the Russian version of the game, start the file "MOO2_RUS.EXE" in DOSBox after unzipping the pack into your MOO2 folder. Available in the download section below.

Russian version 1.31 readme.

1.40 English Fan Patch

The English DOS version sold online is fan patch 1.40b23 from May 2006. Information about this patch can be found in Lord Brazen's 1.40 patch FAQ.

1.50 Fan Patch

Progressive fan patch for the English, German, French, Spanish and Italian DOS versions of Master of Orion 2. Fixes most known crashes, stalls and network synchronization errors, as well as an abundance of interface and game rule bugs. Game help texts have been corrected and expanded upon.

The patch introduces new features like the option to play against a random number of opponents, and interface enhancements that reduce micromanagement like new keyboard shortcuts and editable build queue lists. It has integrated mapgen functionality and supports modding via plain text configuration files so you can easily customize your game! Since patch version 1.50.7 there is (limited) Lua scripting support.

The distribution comes with the mods 1.50 improved, ICE-M, ICE-X and Melee, as well as several mapmods. The game can also be played in a classic mode. In this mode no game rule changes are made via config. Some buggy mechanics are unaltered to preserve classic strategies; for example Fighters retain the +1 extra damage for energy beams (for blitz games) and the buggy Lightning Field guarantees survival of 50% of missiles in a stack (for Guardian rush games).

A big manual is part of the documentation of the patch, containing detailed descriptions of bug fixes, new game mechanics, modding options, scripting support and notes on various game mechanics.

The included MOO2 Launcher allows you to easily install the patch, configure several DOSBox options and select your mod and mapmod of choice before running the game. The Launcher defaults to '1.50 improved' after initial installation.

MOO2 Launcher readme.

1.50 fan patch readme.



Version Language Date Size (kB)
1.50.13 en, de, fr, es, it 5 Dec 2018 9600 199
1.31 ru 10 Apr 2007 1455 360
1.31 de 11 Apr 1997 2342 609
1.31 en 11 Apr 1997 3350 1249

Mods & Maps

Version 1.2 Mod

Earlier this year, I meticulously studied the differences between MOO2 versions 1.2 and 1.3, which resulted in the updated 1.1-1.31 changelog for the classic versions. This 'Version 1.2' mod emulates version 1.2 rules as closely as possible with current 1.50 config: Restored Ion Cannon, Plasma Cannon and Gyro Destabilizer. Also original (weaker) Guardian and Antaran ship designs. And the Creative ability at 6 picks of course! (314 downloads; 67 kB)

1.50 Improved

Included in the 1.50 download and the default choice in Launcher, 1.50 improved enhances classic with Ship Initiative II (YouTube video), interactive combat stats, updated AI ship designs, removal of quirky classic behaviors, several tweaks, and an AI that can research hyper-advanced techs.

ICE 21

The ICE mod changes many aspects of the game, aiming to create a more challenging game: Stronger AI opposition; revalued race ability costs (48 picks instead of 20); revamped tech tree; beefed up Guardian; more threatening Antarans and a grand finale when invading the Antaran home world!

Custom Race Design
All attributes, including governments and special abilities have been revalued. Some are more expensive like Unification and Lithovore, and some are cheaper like Ship Defense and Ground Combat bonuses. In classic MOO2 you can design a race with up to 20 picks (10 base picks and 10 negatives). In ICE there are up to 48 picks available (24 base and 24 negatives). This allows for a more precise valuation of the different traits. The 8 extra picks make construction of very powerful custom races possible. The stock races have been redesigned to match the new picks.

Custom Race

Mind Control
The most overpowered trait in classic MOO2 is the Telepathic ability at 6 picks. In ICE, Mind Control requires a Titan or Doom Star class ship instead of a Cruiser so quick tele-blitz games are no longer possible.

Population Capacities
Population limits have been increased and all climates and planet sizes have different max pops. A standard medium Terran world now supports 15 instead of 12 population units. There are no more planets with max. 1 pop! Tiny radiated and toxic planets have the lowest population capacities, supporting 2 population units.

Technology Tree
In ICE you need to invest 20% more research points to complete the entire tech tree. The placement of various technologies in the tree has changed, but I tried not to stray too far from the classic tree. The crucial tech Research Labs has been isolated. This helps the AI and is good for Uncreative races but lowers the value of being Creative. Fighters are available a little later in the tree. Bombs have been moved from the Power to the Physics branch and many techs have moved positions in the Fields branch.

Tech Tree

Planetary Defenses
Star Bases, Battlestations and Star Fortresses are stronger, have more space for weaponry, and more Marines onboard. All bases have a reinforced hull by design. Researching Reinforced Hull technology does not increase orbital platforms structure points. Satellites and Missiles Bases can be fitted with torpedoes. Missile Base and Ground Batteries have slightly more space for weapons. Fighter Garrison has been upgraded and launches fighters every turn instead of every 10 turns. The Artemis System Net in ICE is much stronger than the default one.

All ships except the Frigate have 20% more base space available in ICE. The Battle Pods bonus has been decreased from 50% to 25%, so total space stays the same (1.00*1.50 = 1.20*1.25). AI's that miss out on Battle Pods now have a smaller disadvantage. Note that the value of Megafluxers has increased, as the 25% bonus is calculated over the larger base space.

AI's design their ships according to a few templates, which I have improved so there are better chances that they show up with something that can actually crack a nut.

Stealth Detection
A new feature in ICE is 'Stealth detection'. In Standard MOO2, you can only detect stealthy ships (Darloks) when you are Omniscient. In ICE you can detect stealthy ships with advanced scanning technologies.

Orion & Antares
The Guardian has a Class X Shield, making it much harder to kill. Be prepared! EMG Merculite missiles were the quickest way to defeat the Guardian in classic MOO2 but they will not have the desired effect in ICE.

The Antarans have a few surprises waiting for you at their home world. Compared to the original, it is really hard to win this way and requires advanced ships. I like a grand finale!

ICE-X boasts AI opponents with more raw power, further increasing the difficulty level. The Impossible level of ICE-X is for expert players, you'd better know what you are doing!

Both ICE-M and ICE-X are included in the 1.50 download and you can choose your preferred version in the Launcher.

ICE strategy and walkthroughs on Civfanatics.

ICE changelog.


New, experimental mod for 2-player tactical combat. The melee map has 4 systems: Orion, 2 home systems, and a neutral system. Each player builds 30 command points worth of ships. Then both players send their fleet to the neutral system and duke it out. No retreating! The loser can now design new ships to counter his opponents ships while the winner must bring his surviving ships into the next fight supplemented with new ships (for again 30 command points total). Fight!

Melee Rules.


Information about this mod can be found on the Orion Nebula. Note that VDC runs on patch version (4691 kB).

Defensive Anti-Blitz Mod

In response to a request on Reddit, I have adapted the old Defensive Anti-Blitz Mod by Jukka Mikkonen to run on 1.50. I haven't changed it much, enabled a few qol improvements and corrected a few issues with the original mod. DAB version 6 is for patch version 1.50.11 or higher. Highlights: Missile Base has 800 (instead of 300) space units - An upgrade to ship hit points, and even larger for star bases - Strong ground installation with 10x the hit points - Severely upgraded space monsters & Guardian of Orion, damagewise - Antarans should prove to be a threat once again - A few automatic techs, such as Auto-Factory, Fighter Bays, Fighter Garrison, Reinforced Hull and Heavy Armor. v6 (262 downloads; 88 kB)

Open Challenge 1 by Kraft57

You are an uncreative telepath, starting in a corner of a large galaxy. Can you win within 100 turns? To play this map, download the file, rename it to SAVE10.GAM and copy it to your MOO2 folder. Then load save 10 from the universal menu and start! Works on 1.31, 1.40, 1.50 classic and 1.50 improved.
SAVE10_OC1_KRAFT.GAM (1071 downloads; 95 kB)

Open Challenge 2 by Rocco

You play an uncreative race, starting in an isolated region of space. Can you get out, and what resistance will you meet if you do? To play this map, download the file, rename it to SAVE10.GAM and copy it to your MOO2 folder. Then load save 10 from the universal menu and start! Works on 1.31, 1.40, 1.50 classic and 1.50 improved.
SAVE10_OC2_ROCCO.GAM (1154 downloads; 204 kB)

3 Stars Puzzle

You play as the Humans and start in a system with five good planets, but the galaxy only contains three stars! To play this map, download the file, rename it to SAVE10.GAM and copy it to your MOO2 folder. Then load save 10 from the universal menu and start! Works on 1.31, 1.40, 1.50 classic and 1.50 improved.
SAVE1_3.GAM (1107 downloads; 204 kB)

The Tragedy of Orion

You play as the Humans and start in the corner of a galaxy that has a huge black hole in the middle. To play this map, download the file, rename it to SAVE1.GAM and copy it to your MOO2 folder. Then load the save "The Tragedy of Orion" from the universal menu and start! Works on 1.31, 1.40, 1.50 classic and 1.50 improved.
SAVE1_TRAGEDY.GAM (460 downloads; 204 kB)


Corion2 1.1.1
savegame editor for 1.50; 153 kB; 2509 downloads; readme

MOO2 Workshop
editor suite; 2720 kB; 2260 downloads; readme

HxD Freeware
HEX editor from (external link)