• Real-time, in-place editing with no waiting or compilation
  • All tools let you work with final results in front of you. All tools hot-load into the game as well so if you save your work while the game is running, you can see your changes in-game.
  • Lua script based for the same reasons - add new weapons or game elements while the game is running.
  • Keep dependencies between systems to a minimum to allow them to be used independently and in novel ways
  • Allow content creators to work the way they want to work - don't impose a specific pipeline or workflow

Spark includes:

  • A simple, powerful level editor
  • Cinematic editor (used to build our teaser)
  • Art builder tool (no more command-line, just save in 3DS Max, Maya, Photoshop, etc.)
  • Decoda (Lua script IDE)
  • View media
  • View media
  • View media
  • View media
  • View media
  • View media
Post article RSS Related Articles

Computer Core

Something must be in the air at Unknown Worlds. Not only are we announcing new games, we’ve also started hitting deadlines! We promised you Eclipse at the end of 2013, and with 11 days to spare we are proud to announce that is has been released!

Eleven years ago, Eclipse was one of the original Natural Selection battlefields. Tight corridors, multiple Hive spawns, iconic rooms, Eclipse was one of the greatest maps ever made for the original Half-Life mod.

Marine Start

Now, we can all return to Eclipse. Painstakingly recreated, the map is faithful to the original while allowing for the evolution of Natural Selection 2 gameplay. By taking advantage of Spark’s modern rendering techniques and UWE’s art resources, the mapping team has been able to remake every corner of Eclipse in exquisite detail.


The team that built Eclipse was led by Jake ‘Jonacrab’ Smith. Under the artistic direction of Cory, Jake drew together work from mappers Oliver ‘Dux’ Hobbs, Michael ‘Olmy’ Schouten, Andrew ‘Insane’ Jones, Marc ‘Sgt Barlow’ Newton, and art from Sergey, Dmitry, Yuri and others from Fox3D.

Looking towards East Foyer

Eclipse is included as part of Build 262, which was just released on Steam. Build 262 is free for all existing players of Natural Selection 2, and includes a bunch of other improvements to the game. Here is the full change log:


  • Fixed players sometimes being stuck in command station at round start
  • Fixed Infestation blobs blocking commander view
  • Server Browser now highlights player count yellow if the server is semi-full due to reserved slots.
  • Removed texture streaming option from main menu since it wasn’t doing anything
  • Fixed all structures being outlined blue when on overhead mode as spectator
  • Fixed projectiles colliding with invisible movement collision group
  • Fixed ECHO_HARVESTER tooltip missing when echoing an Harvester
  • Fixed accidental use of voice order keys while ESC menu is open
  • Fixed bug where marine buy menu did not close when player was Stomped
  • Fixed Stab not having a custom icon
  • Fixed round start music not playing due to incorrect path
  • Fixed WhipBomb showing killed with BileBomb in console
  • Fixed loading screens using the wrong art sometimes
  • Fixed commander bindings reverting to default if a player joins a server before opening the options menu


  • Added new map: Eclipse
  • Added new main menu background
  • Added egg counter for Alien Commander in the top of the commander interface
  • Added Hive skill and level stats under name in main menu
  • Added support for new structures in ScenarioHandler. Added one other check path that works.
  • Added link to forums by clicking logo
  • Added remixed NS1/NS2 main menu theme


  • Ammo packs now refill all weapons instead of only the active one


  • Limit hit effect messages to 100 per second
  • Correctly limit max resources network field to 100 per player
  • Reduced network traffic generated by static structures
  • Implemented extra precaching to reduce incidence of hitching at the start of rounds
  • Optimized network traffic produced by Insight spectator system
  • Minor optimizations for skulk movement (optimized wall traces and removed predict wall walking)


  • Insight spectator system now outlines players in overhead view by default
  • Replaced “request enzyme” with “request drifter” in the Alien ‘commo-rose’
  • Servers with cheats enabled no longer send data to the Hive stat tracking system


  • Revert auto-generation of overviews by Builder due to Overview.exe crashes
  • Fixed crash in editor related to file type properties
  • Allow mappers to define custom round start music in ns2_gamerules entity
  • Added console command playmusic. Usage: sound/NS2.fev/pathtosound

Refinery (Thanks SamusDroid)

  • Fixed pathing in Lava Falls
  • Fixed some textures and gaps
  • Fixed some stuck spots
  • Adjusted some death trigger scales


Natural Selection 2 2 comments

On this day, Halloween 2012, Natural Selection 2 was launched on Steam. The following year has blown our minds at Unknown Worlds. More people have purchased...



Natural Selection 2 6 comments

In February, NS2 was Gorgeous. Now, it is Reinforced. The culmination of nearly six months of development, Reinforced takes Natural Selection 2 to new...



Natural Selection 2 19 comments

Some builds just want to watch the world burn. Build 251 has been in the works for quite some time – Unlike the new heir to the British throne, it did...



Natural Selection 2 5 comments

Another month has passed in the Unknown Worlds office, and Natural Selection 2 continues to be improved, tinkered with, and polished. Continuing on from...

Add game Games
Natural Selection 2

Natural Selection 2

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...

Future Perfect

Future Perfect


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: Combat

Natural Selection 2: Combat

First Person Shooter

Natural Selection 2: Combat is a first-person team-oriented multiplayer shooter developed by Faultline Games and published by Unknown Worlds Entertainment...

Comments  (0 - 10 of 23)

Is this easy-on-the-fly modding of the game code in LUA the reason for the poor performance? It is impressive how fast you can develop using this, anyway.

Reply Good karma Bad karma+3 votes

This is an awesome engine, and the editor truly an ease to work with. Would be great to see real time radiosity implemented. Keep up the great work.

Reply Good karma Bad karma+3 votes

For anyone who wanted to know it is made in Lua

Reply Good karma Bad karma+2 votes

Is this engine made with XNA with C# or was it made with with C++ because I've seen multiple videos of people saying it's made (one of the 2 above)?

Reply Good karma Bad karma+2 votes

It's coded in C++. Unknownworlds.com

Reply Good karma Bad karma+2 votes

Man, I hope this engine gets released soon :p

Reply Good karma Bad karma+4 votes

You guys should update this page. It'd be cool to have the Natural Selection 2 Beta Trailer on here. :)

Reply Good karma Bad karma+3 votes

when licencing the engine, what do you get?

- the full c++ source code?
- if so, is everything well documented?
- are shaders gonna be supported? if so, will there be a visual shader editor or something like that?

we are really interested in the engine, but i couldnt find any information about the mentioned points :(

Reply Good karma Bad karma+5 votes
SgtBarlow Creator

Spark is still in development so its currently not got an licencing plans in place yet nor would the be much documentation written. The main focus is Natural Selection 2. untill that project is compleated you may have to hang on for a short while.

Shaders are supported, they can be dropped in to a mods shader folder.
There maybe some limitations but something like --Post Bloom-- I was told would be very easy to add.
There is currently no shader editor that i have seen, Not taken an interest in it just yet but they have a shader compiler as well as a number of other mini tools that are currently automated by their Builder.

Reply Good karma+3 votes

the most awesome thing ever

Reply Good karma Bad karma+3 votes
Post a comment
Sign in or join with:

Only registered members can share their thoughts. So come on! Join the community today (totally free - or sign in with your social account on the right) and join in the conversation.