Research and Development is a puzzle-centric mod for Half-Life 2: Episode Two featuring an unarmed player but plenty of violent mayhem.

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28 comments by Varsity on Jul 20th, 2009

PC gaming super-blog Rock, Paper, Shotgun loves R&D! In a new review Alec Meer praises the mod as "a seismic shift" away from the norm, telling readers that it is "as must-play as an HL2 mod gets":

R&D’s hook is that it’s essentially non-combative. Yep – you go without guns throughout (bar the ol’ Gravity jobbie, but hey, that’s more about construction than destruction here). Sure, you can tell an Antlion to claw someone to death or arrange to squash men with falling girders, but you’re definitely not Edward Pistolhands. It’s an environmental adventure game, taking the irregular physics and logic puzzles seen in HL2 itself and turning them into the game itself. Mazes, gravity, exploding microwaves and fire-retardant antlion carapaces all make an appearance – it’s very much a point’n’click adventure in an FPS engine.

If you still haven't played Research and Development, which requires Episode Two, download it now!

Update: Destructoid also has a very positive review.

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Research and Development (installer)

Research and Development (installer)

Jul 18, 2009 Full Version 52 comments

Updated 17 July 2009, fixed several issues & added a dynamic crosshair when using the keypads & lab buttons. Requires Episode Two.

Research and Development

Research and Development

Jul 17, 2009 Full Version 29 comments

Updated 17 July 2009, fixed several issues & added a dynamic crosshair when using the keypads & lab buttons. Requires Episode Two.

Post comment Comments  (30 - 40 of 751)
saphiraDark Jul 5 2013, 7:12pm says:

GAHHH FIX YOUR GAMES AS IT IS NOT WORKING AND I CANT FIX IT GAH.........-_- i really want to play this but cant when the game will not even launch i am getting that "startup_loading files" error and when i go to download one now i am getting a "could not load library client" please fix the game and hurry some of us want to play this mode.

0 votes     reply to comment
Israphelo Jul 7 2013, 4:48pm replied:

have you notice the last article for this was in 2009? the creator doesn't give a **** cus he does not profit from this

-1 votes     reply to comment
MosquitoMan55 Jul 14 2013, 7:51am replied:

A bit harsh of you to say... You make modders seem so cold..

+2 votes     reply to comment
Iseeicy Jun 6 2013, 8:17pm says:

Getting an error on startup. It says cannot find background. Any help?

+3 votes     reply to comment
michaelfiamski Jun 28 2013, 8:36pm replied:

I have the same exact problem. I even tried taking the startup_loading files from Underhell and copying them to the console folder, and I ended getting getting an error that said: Could not load up library. I hope the developer can fix this mistake.

+2 votes     reply to comment
Israphelo Jul 4 2013, 7:41pm replied:

did the same thing

+1 vote     reply to comment
saphiraDark Jul 5 2013, 6:30pm replied:

any fix for this?

+1 vote     reply to comment
TrevorMag Mar 29 2013, 11:18pm says:

I have a problem in Chapter 2, entering the code digits into the keypad to get the energy cube.
NB: this is NOT the well-known old problem, where the wrong buttons were being pressed by mistake (which was solved by "crosshair 1")
I have the newest version, with crosshairs AND "finger-cursor" when I approach the keypad.
No matter where or how I press, NOTHING lights up - not the "ring" around the button digit, not the coloured lights above the keypad. Nothing. It is as if the mouse button clicks are being completely ignored.
I am running Windows 7, 64-bit.
If anyone has any ideas, please share them. I cannot progress any further into the game.

+2 votes     reply to comment
TrevorMag Apr 7 2013, 8:32pm replied:

Update: Thanks to "Sparks" at, for pointing out to me that you don't press the buttons with the mouse, but instead with "use" (E). I haven't comfirmed that yet, but I'm sure that's nailed it.
I'm 25% embarrassed, but not a single percentage point more: the way the mouse cursor turns into a finger is more than a "hint" to press the mouse button - it's hardcore blatant. Still, the rest of the mod is awesome, and I should acknowledge that a one-person show can't afford level of QA and play testing that the major studios can.

+1 vote     reply to comment
TrevorMag Mar 29 2013, 11:29pm replied:

Additional info:
(a) The console is frantically scrolling this message:
Material models / magnusson_teleporter / magnusson_teleporter_fxglow1 does not support vertex format used by the mesh (maybe missing fields or mismatched vertex compression?), mesh will not be rendered. Grab a programmer!
(b) there are six mouted square plates, three on each side, of the energy cube containment cylinder. The INSIDE faces of these squares are transparent, allowing me to see the wall on the other side. (The outside faces are rendered correctly).

+1 vote     reply to comment
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Released Jul 14, 2009
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Highest Rated (13 agree) 10/10

Let me start by saying this was exactly what I was looking for when I began looking through the hl2 mods available here. For some reason I love any puzzle elements executed in the hl2 engine and enjoyed all the little puzzles you had to solve throughout the actual hl2 game itself and R&D pretty much mixes all those great moments into one sweet package.

Research & Development pretty much a perfect mod for any fps puzzle lovers and the only thing I can hope for now is a sequel :D

Feb 28 2011, 7:36pm by Akito8

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