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  (10 - 20 of 57)
SERgius Jul 9 2013 says:

Hey there. I just bought this game recently after playing the demo.(worth every penny =) ) But now i got this error that i can't solve.

+2 votes     reply to comment
Kalus Creator
Kalus Jul 10 2013 replied:

Hello, can you tell me any other details about the error you encountered? You can do this by checking the errorlog.txt file inside the Content folder where Operation : SD is installed. thanks

+1 vote   reply to comment
SERgius Jul 10 2013 replied:

Sure. Here is a part of it

7/9/2013 12:48:49 AM : System.IO.FileNotFoundException: Could not find the file C:\Users\Owner\Documents/Innomen Productions/Operation SD/ShipDataFile but found the directory c:/users/owner/documents/innomen productions/operation sd/ Did you type in the name of the file wrong?

+1 vote     reply to comment
Kalus Creator
Kalus Jul 10 2013 replied:

Go to C:\Users\Owner\Documents/Innomen Productions/Operation SD/ folder and check if the ShipDataFile is present there.

If not, go back to where Operation:SD was installed and go to Content/Databases/ folder and copy the ShipDataFile from there.

You might also want to copy the MissionDatabase.csv file from the Content/GlobalContent/ Folder if the said file is not yet present in the operation sd save directory.

Alternatively, you can run the OPSDSettings.exe (it might give an error, just press continue) and press the ResetSaveData button.

+1 vote   reply to comment
SERgius Jul 11 2013 replied:

Ok So The game finally running but i ran into error. The game started with half the screen showing and then it close. I check the error report and this is what i got.

System.NullReferenceException: Object reference not set to an instance of an object.

+1 vote     reply to comment
Kalus Creator
Kalus Jul 11 2013 replied:

That is odd. Try re-installing the game to see if it fixes things up. The error indicates it cannot load/find certain resources. Also are you installing the game from the stand alone build or the Desura build?

I also seem to have the half screen problem where the videos are supposed to play. I suspect an XNA problem seeing as we made the game on XNA 3.1 it probably didn't aged well. You can still access the tutorial videos inside the Content/Transitions folder as wmv files.

+1 vote   reply to comment
SERgius Jul 12 2013 replied:

I got from the desura Build. and I also tryed re-installing several time, but it still having that same bug.. plus i don't seem to have that transtion folder of any sort.

+1 vote     reply to comment
Kalus Creator
Kalus Jul 12 2013 replied:

Hmmm, if you don't see the Transitions folder inside the Content folder then something must have gone wrong with the downloading/installing process.

Also, there should be 3 files inside the Operation SD savedata folder (the one inside your documents folder) namely ShipDataFile, MissionDatabse.csv and ErrorLog.txt.

if you see all of them there and you still have an error then try downloading standalone version. I tried installing via Desura on my end and it worked out just fine so I am quite stumped at the moment on what the problem on your end is XD.

+1 vote   reply to comment
SERgius Jul 12 2013 replied:

Uh right. where to find taht stand alone version...

+1 vote     reply to comment
Kalus Creator
Kalus Jul 12 2013 replied:

try going to this link.

+1 vote   reply to comment
SERgius Jul 12 2013 replied:

Thank you. the game is finally running but the small videos still have that half a screen thing. everything else is fine.

+1 vote     reply to comment
smartysmars May 27 2013 says:

interesting game.

+3 votes     reply to comment
Seryuu13 May 1 2013 says:

Hm this looks interesting i give it a tray

+3 votes     reply to comment
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
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