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

Image RSS Feed Latest Screens
Research and Development Research and Development Research and Development
Blog RSS Feed Report abuse Latest News: RPS digs R&D

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.

Media RSS Feed Latest Video
Downloads RSS Feed Latest Downloads
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  (70 - 80 of 742)
Boomerbuster Mar 28 2011, 10:15pm buried:


there are so many bugs in this none of my saves stay there after i close the game when i open it agian they are gone the levels dont unlock even after i beat them i cant do anything beacuse it always glitches and either blocks off the path or what im supposed to do isnt there i even checked with my friend who has it and for me the game just doesnt workl. the way will randomly get blocked by invisible walls the gravity gun will randomly stop working this mod is a pîece of **** when it comes to accully working.

-11 votes     reply to comment
Cremat0r Jun 1 2011, 9:25pm replied:

For me and like ten thousands of others it just worked fine.

+3 votes     reply to comment
redkaos Jun 10 2011, 8:15am replied:

I did get the same problems but the whole mod can be completed within 30 minutes to an hour. I loved the mod and wish for more of it.

+2 votes     reply to comment
Hughjarse Feb 25 2011, 11:02am says:

This is the most awesome mod for Half-life 2 I have ever played. great work!

+4 votes     reply to comment
Ennui Feb 15 2011, 11:23pm says:

God, I wish there was a Research and Development 2.

... pretty please?

+15 votes     reply to comment
Evill_Bob Feb 9 2011, 10:01pm says:

Not much replayability but like Portal it's one heck of a first playthrough.

+4 votes     reply to comment
lahtis Feb 9 2011, 2:11am says:

why this game does not fix these errors, which have been reported. Review drops all the time.

0 votes     reply to comment
kazarr Feb 6 2011, 8:01am says:

I have an issue. I am at the part where I get to ride in Mr Whirly, the Ev.I.S.Ce.R.A.T.O.R. But I encountered what seems to be a bug at the part just after jumping over the truck with exploding barrels and zombies. I pressed E to get out of the cart and explore, but instead of regaining control of myself, I was remote-controlling the buggy now. That is to say, I was no longer attached to it (could jump and use the gravity gun) but the WSDA keys now controlled the still working buggy instead of myself.
Lolz ensued when I attempted to drive the buggy forward with myself still in it using the gravity gun, and I even managed to beat the antlion guards that way. But the Antlion Guards pummeled me onto a container behind a couple of pickup trucks, and now I am stuck there, left only in control of the buggy, that can't even reach me to kill me.
Is there any way to progress? Maybe a console command that lets me regain my control?

+2 votes     reply to comment
Fillfree May 19 2011, 11:42am replied:

I have this problem like kazarr too.

Plz Fix it!!

+1 vote     reply to comment
roast Feb 3 2011, 12:34am says:

Excellent mod, had an absolute blast playing it, thanks for an awesome game, and best of luck for any future mods!

+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

Half-Life 2 Icon
Developed By
Send Message
Release Date
Released Jul 14, 2009
Mod Watch
Track this mod
Community Rating



1231 votes submitted.

You Say


Ratings closed.

Highest Rated (12 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

First Person Shooter
Single Player
Embed Buttons

Promote Research and Development on your homepage or blog by selecting a button and using the HTML code provided (more).

Research and Development Research and Development
Research and Development
1,110 of 21,897
Last Update
3 years ago
1,225 members