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Unknown Worlds is a self-funded, independent game company in San Francisco, CA. Our goal is simple: to unite the world through play.

We are currently working on Natural Selection 2 on our own custom engine. Past titles include Natural Selection and Zen of Sudoku. We have also worked on titles such as Previously, we worked on titles such as Titan Quest, Titan Quest: Immortal Thone, Empire Earth (two million copies sold) and Mindrover (PC Gamer 89%).



Updated 2 months ago TBD with a commercial licence

The Spark engine is designed to enable small teams to make immersive games. As a tiny team ourselves, having tools that let us iterate extremely quickly...

Future Perfect

Future Perfect Future Perfect

Updated 2 months ago TBD Multiplayer & Co-op Adventure

Future Perfect breaks down the barrier between having an idea for a game, and playing it with friends. The Future Perfect interface allows you to create...

Natural Selection 2

Natural Selection 2 Natural Selection 2

Updated 1 year ago Released Oct 28, 2012 Multiplayer Real Time Shooter

Natural Selection 2 is the sequel to the popular Half-Life mod Natural Selection. It is built on our own engine and will be distributed through Valve's...


Subnautica Subnautica

Updated 9 months ago TBD Single Player Adventure

Subnautica is an open world underwater exploration and construction game. We are Unknown Worlds, the developers of Natural Selection 2, and Subnautica...

Zen of Sudoku

Zen of Sudoku Zen of Sudoku

Updated 2 years ago Released Jun 16, 2006 Single Player Educational

Sudoku is a pattern-matching puzzle with one rule: place the numbers 1 through 9 such that there is only one of each in every row, column and 3x3 box...

NS2:Last Stand
Natural Selection 2

NS2:Last Stand

Updated 1 year ago Released Apr 29, 2013 Multiplayer First Person Shooter

Last Stand places a team of marines in a desperate, no hope scenario. Against overwhelming odds and with limited equipment, the marines must survive until...

RockDown - Fighter
Natural Selection 2

RockDown - Fighter

Updated 1 year ago Released May 6, 2013 Multiplayer Fighting

RockDown is a free 2 Player On-line Fighter game for owners of Natural Selection 2 created by a small group of developers from Unknown Worlds, Creators...

Post comment Comments
Cremat0r Jun 7 2010, 9:34am says:

You really should earn hundreds of thousands of dollars with your game, you deserved it!

+5 votes     reply to comment
Mkilbride Nov 25 2010, 12:37am buried:



-19 votes     reply to comment
GreenMagicDust Mar 31 2010, 9:08am says:

can i join can be bt :)

+2 votes     reply to comment
Cybio Feb 20 2010, 12:00pm says:

I think you should change on your NS1 Page that you are working on NS2 as a Mod for Hl2 ;-)

+1 vote     reply to comment
Runekn Feb 21 2010, 5:16pm replied:

NS2 is no mod, or is it that you are talking about?

+5 votes     reply to comment
PaiSand Dec 14 2010, 1:26pm replied:

No, it was not meant to be a mod but a full stand alone game. Initially started being developed on the Source engine but due to the limitations on this engine they decided to go and start their own engine, now known as Spark.

+3 votes     reply to comment
Cybio Apr 24 2010, 9:51am replied:

Yeah but you wrote that NS2 is a Mod for HL2 there ;-)

+1 vote     reply to comment
Kalenov May 20 2010, 3:59am replied:

God that was -years- ago xD Back when NS2 was first announced, to the best of my knowledge, it was supposed to be a HL2 mod :P I think that's what he's talking about.

+4 votes     reply to comment
Cybio Jun 19 2010, 2:37pm replied:

Yes, that is what I mean ;-)

0 votes     reply to comment
AltTabber Feb 22 2009, 1:09am says:

Hey I'm a big fan of Zen of Sudoku.

We need more games like that, well brain-trainers in general, but more specifically... perhaps Zen of Kakuro?



0 votes     reply to comment
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Nov 11, 2007
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16hours 23mins ago

RT @futureperfgame: Automatons, killer robots and falling stacks of chairs... Update 8 is now live on Steam! T.co http://

Jan 27 2015, 5:58pm

@rule_robin we don't know - we would like it to be some time in 2015

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RT @futureperfgame: Update 7 is now available! (Get FP here: T.co) work continues on Heist mode! T.co h…

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RT @Subnautica: Update 8 won't arrive today, but we're pretty confident it will surface tomorwow (Friday 16th). Stand by!

Jan 15 2015, 5:21pm

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