Set in the year SE 3256, the player is thrust into mankind's first interplanetary war between the Earth Alliance and the Ares Confederation. As the promising captain of the experimental dreadnought prototype, codenamed Sierra. Your sole objective is to help turn the tides of the war, utilizing the ship's advanced combat systems, flexible energy allocation and optimized platform deployment capabilities. To the captain, the core principles of prudence, guile, resource management and patience are essential to survival. The technology incorporated in Sierra allows it to explore multiple paths to victory: evade and assault enemy ships in classic broadside warfare; research armaments and upgrades to outgun the enemy fleet; or outnumber them with remotely-controlled weapon platforms. Rout the enemy’s armada in order to quell the rebellion and save Earth from the corrupt colonials.

Image RSS Feed Latest Screens
Additional Screenshots Additional Screenshots Additional Screenshots
Blog RSS Feed Report abuse Latest News: Operation SD: Space Defense Rebuild August Update

0 comments by helrouis on Aug 7th, 2013

We have finally opened our website where updated content will be posted two to five times a week. If you wish to track our detailed progress, simply visit regularly or subscribe to our RSS feed. If you have any inquiries, suggestions, or feedback, let us know by using our contact form at .

All details about Sierra Ops' release date for both demo and full version will be set on our milestones page . There is also an active Status Report page which updates the numbers automatically whenever we finish a single asset.

Here are our new backgrounds:

Game system
- 75%
- Working OP:SD Game System migration, hp/shield bars, EN Allocation
- Working Dev/Mission Screen functionality
- Working VN feature
- Bug Fixes

Script - 90%
- 19,108 words for common route
- Estimate of complete version including branching - 25,000 words

Artworks - 67.5%
- 3/20 stage backgrounds + 3 in progress
- 2/10 Ship Interior + 2 in progress
- 2/12 CGs
- 10/10 UI, Animation in Progress
- 20/20 Ship/Platforms/Weapons Assets, Animation in Progress
- 5/20 Particle Effects
- Normal maps for environmental lighting effects on all ships - finished!

Music - 80%
- , Operation SD: Space Defense playlist

When we post our next news article, it will be about the Alpha or Demo Release. We're hoping to receive more feedback so we can make Sierra Ops the best we can.

If you wish to support us, simply purchase the first version of the game, Operation SD: Space Defense if you haven't, or more simply, share our rebuild plan to your friends or relatives. The full game page of Operation SD: Space Defense including its downloads will be changed totally to the rebuild version as soon as it's completed, so the previous version of the game will most probably be overwritten entirely.

Thank you for taking your time in reading, and have a pleasant day!

Media RSS Feed Latest Video
Downloads RSS Feed Latest Downloads
Operation SD (demo)

Operation SD (demo)

Mar 28, 2012 Demo 1 comment

Press "read more" for instructions on how to play the game.

Post comment Comments  (20 - 30 of 57)
cybersleuth58 Nov 27 2012 says:

I cannot get it to run. First I get the error there is no suitable graphics card. Then it tells me it requires pixel shader and (I am blanking). Then it crashes. Any ideas?

+2 votes     reply to comment
Kalus Creator
Kalus Nov 28 2012 replied:

Hmm, can you tell me what is your video card? This error usually happens if the video card of your current setup does not have at least pixel shader 2.0. ( A requirement of the XNA framework)

+2 votes   reply to comment
dickheadstrong Jun 17 2012 says:

I am trying to play demo version. I only get blank screens during tutorials (with "Next" or "End Tutorial" button on lower right of screen). I can't find any other instructions or even get to the options to set up the controls. If I could find that at least I'd know what controls/commands I'm supposed to have.

+2 votes     reply to comment
Kalus Creator
Kalus Jun 17 2012 replied:

That's odd, the tutorials are supposed to be video encoded in wmv format. The reason why you're getting blank screens is probably a video codec problem of some sort. Try updating your windows media player/video codecs to see if it helps. The controls are fixed so you unfortunately can't set up the controls. Other than that, you can try to play the tutorials inside the Content/Transitions folder on your favorite media player its numbered sequentially so you should have no problems. If all else fails I can give you a rundown of the controls in text format.

Hope it helps.

+2 votes   reply to comment
dickheadstrong Jun 24 2012 replied:

Thanks for the help. I'll try opening the vid's with Zoom Plyr. Are the controls fixed on the full game too? Or just the Demo?
Don't worry about answering right away. Just got the original Deus Ex ($2.49 on Steam this wkend only).
Just wanted U to know that your Human (I'm assuming) response/interaction is greatly appreciated. IIf half of the games on desura are equally supported, I'll be buying a lot more games here instead of steam. (I AM cheap. I mostly buy games < $5 or $10, so it's not a big win 4 U.)
But Thanks, Anyway.

+2 votes     reply to comment
Kalus Creator
Kalus Jun 25 2012 replied:

The controls are fixed in the full version too.

+2 votes   reply to comment
Crusender May 2 2012 says:

me i have some kind of bug whit desura... i can install demo, i can launch it and play it no problem. I buy the game, uninstall the demo, Install the full version, launch it, then a error appear that say go to error file for see the error but the file it is empty. So i download the installer, install it and work fine, but desura one still not working....

+2 votes     reply to comment
Kalus Creator
Kalus May 2 2012 replied:

Just to clarify things is the version of the game on desura 1.0b? Also, which error file did you opened? the one located in the mydocuments or the one located in the content folder?

+2 votes   reply to comment
Crusender May 2 2012 replied:

empty one was game folder, i find the one in my document just said, the error look like it missing the shipdata file in my document. look like when installing via desura it dont install shipdatafile in mydocument.

+2 votes     reply to comment
Kalus Creator
Kalus May 2 2012 replied:

Its probably because the savedata folder in the mydocuments doesn't contain the shipdatafile but has the folder itself. I have just tested it now deleting the whole savedata folder should resolve this problem.

+2 votes   reply to comment
Crusender May 3 2012 replied:

it work, thx for the help

+2 votes     reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Operation SD: Space Defense
Developer & Publisher
InnoMen Productions
Custom Built
Send Message
Official Page
Release Date
Released 2012
Game Watch
Track this game
Community Rating



21 votes submitted.

You Say


Ratings closed.

Highest Rated (2 agree) 10/10


2,29 € Only? + 2 12/10

Apr 10 2012 by stygma1982

Tactical Shooter
Single Player
Embed Buttons

Promote Operation SD: Space Defense on your homepage or blog by selecting a button and using the embed code provided (more).

Operation SD: Space Defense Operation SD: Space Defense
Operation SD: Space Defense
Last Update
1 year ago
131 members