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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Matt Bortolino's excellent HL2: Episode Two "action puzzler" has been released from nowhere!

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

(It's really quite good.)Download now!

(If you have trouble pushing buttons accurately, download the July 17th update from the link above.)

(If you can't get out of the cart, open the console and type ent_fire ui deactivate.)

Post comment Comments  (50 - 99 of 99)
norton2
norton2

This is a must have.

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Playerh3ll
Playerh3ll

I see some people have difficulties, I'll make a guide for you .

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Zoook
Zoook

This is an amazing mod. Difficult at times, but that only made it so much sweeter to beat it. Hilarious ending scene.

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klichka
klichka

This was the most awesome thing I played in a while. Please make another one. I can't get enough of these puzzles and I just wish the last portion was a bit longer so I could really see what that baby was capable of.

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Mainblz
Mainblz

Now THESE are the kind of puzzles i was expecting from Curse... Curse was way too easy. These are the kind of puzzles that nothings straight forward for you. You just have to keep tinkering untill you find something.

GREAT work!!! This is now one of my favorite mods.

The mapping was phenomenal, Heavy detail mixed in perfectly with the puzzle gameplay.

Only wish i had more to play :D

Keep up the amazing work!

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Ekonk
Ekonk

Nice screens, I like source puzzeling. Downloading!

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nubblecakes
nubblecakes

Just thought I'd drop a review here too, Matt_b (This is Nub from Interlopers).

This is probably the most interesting and fun mod I've ever played. It had a few kinks, but I never had any game-breaking bugs as others have mentioned. Kind of strange how only certain people are getting these of bugs.

The level design is absolutely superb. It looks professional, but it's no surprise from you. The puzzles were extremely clever; some being very difficult to discover their solutions even though it was sitting right in front of my face, while others were simply downright difficult but not overly frustrating (with the exception of the zombine tunnel when riding the rail cart, that was somewhat aggravating for me).

The last portion of the game was extremely silly, and seemed a little out of place in the mod, but they were REALLY funny. The "launch" scenes were particularly humorous, and I'll never forget the lolcat! Mr. Whirly was pretty unforgettable as well.

I remember chatting with you about making Mr. Whirly and such in the Interlopers Steam chat, and you ended up doing a great job on it. Everything about it came to fruition it seems, like having players actually build the thing then get to use it. I can agree with others though that the controls were very drifty and wonky. From what I gathered, the actual Mr. Whirly was parented to an invisible airboat; that being the only suitable vehicle base you could use for it.

Anyway, you did an amazing job overall. Every puzzle was original and well-made. The minor bugs I ran in to were no real setbacks for me and it would make no difference if they were there or not.

Keep up the great work man, I can't wait to see what else you have in the works.

Oh yeah, thanks for letting me use the models from your mod in my own map. :D

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N3WMAN
N3WMAN

Amazing. Possibly the best single player mod I've played this year or maybe even ever. Every thing about this mod is awesome.

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Frednol
Frednol

That was the greatest boss battle I have ever seen. I am in awe.

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Screamowic
Screamowic

One of my most favourite mods so far with really cool gameplay and refreshing ideas.

Keep up the good work! :D

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RunningJack
RunningJack

This mod is just awesome!!!
i really hope that there will be a 2nd part of this mod!
this kind of gameplay is real fun!!

And the vehicle at the end, was the greatest i have ever seen in a game!! ;)

great job!!!

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Film11
Film11

Absolutely stunning. The level of detail that's gone into making this is on par with MINERVA, at least!

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Fartingo
Fartingo

As fun as it looks, I can't play it, it doesn't show in steam games, and by the time you FIX IT, the people putting spoilers in the comments will have ruined the whole thing. So yeah, FIX IT!

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Varsity Author
Varsity

You need Episode Two.

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Fartingo
Fartingo

I have it!

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Playerh3ll
Playerh3ll

Try restarting steam, verify if its put in sourcemods.

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Fartingo
Fartingo

I restarted Steam, too. This mod is just plain broken.

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Mainblz
Mainblz

Is Episode 2 INSTALLED? and if it is, have you ever RUN it since you installed it?

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mavman
mavman

It was very cool! Fun, action, humour with a good level design, congrats!

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HopEoj
HopEoj

Absolutely awesome game, really makes yuo think :D :D
Outro is immense, even if it is that long :D :D

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liqid
liqid

The fixed version is definitely an improvement. 10/10 after the fix - as promised.

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RocketSurgery
RocketSurgery

im stuck in the room with all the steam and the conveyor belt to the left side of a fence, anything obvious im missing?

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Varsity Author
Varsity

Just punt around. ;)

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RocketSurgery
RocketSurgery

ok yeah, that rusty pipe thing isnt too obvious enough imo

no problems after that trial and error grenade tossing part

just beat it, hilarious ending

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DuckSauce
DuckSauce

yeah rusty pipe thing wasn't obvious at first for me either, luckily you're stuck in a small area where you can happily punt around only a limited amount of stuff so that makes it easier to find out :D

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Tokoya
Tokoya

Moddb needs a Hall of Fame section just for mods of this caliber

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CrasherBuu
CrasherBuu

This mod is one of the most epic mods out there, with slow motion explosions and what-not. I really enjoyed how you get to fight indirectly with the antlion in the beginning, and also stuff like zapping the fools fighting in the water.

The boss battle was insanely awesome, even though it seemed a little wierd that the car handled like a boat (Took some getting used to)

Only problem i had was the second key code thing, i simply couldn't do it, so i noclipped through the door.

Well, then another problem being that it ended...

So, when are you going to release a sequel? ^____^

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Lee1337
Lee1337

THIS, was the BEST mod i ever played!!!!!!!!!!!!!111

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VanderOZ
VanderOZ

The most epic mod I have ever played. I dub thee Episode 2.5!

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St0rmtr00per
St0rmtr00per

Great mod , but I have a problem with the numpad at the part with the energy cube, the code with the colours and so on... How can i press the number i want? it's so difficult to press the right number... :( I can't aim or anything else..

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Varsity Author
Varsity

Get the updated version.

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St0rmtr00per
St0rmtr00per

ok, Thanks ! this may helps :D

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tylenol
tylenol

Played it, loved it, enough said.

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Lacabra
Lacabra

Astonishingly awesome mod.

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AlekZanDer
AlekZanDer

THE BEST!But writing a code without a croshair,and the fuse box puzzel are immposible puzzels.Work on them a little.I had to use NOCLIP to pass them.

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Cirdain
Cirdain

Someone isn't very good and should tried beating in the lock or on the other one pick the ******' spade up and stab the ceiling panels like it ****** your mum.

Sorry I got a bit carried away there.

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obdes
obdes

Does anybody have a clue how to manage the microwave part? I'm desperate.

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JoshuaC
JoshuaC

I cannot exit the car like most others. The rest of the level after the antlion guards is inaccessible due to this bug.

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i_believe_in_cancer
i_believe_in_cancer

I get a crash to desktop when I start a new game. Anyone else experiencing this problem or know a fix?

I have tried both versions and reinstalled the latest version but I am still having the same issue.

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spellman23
spellman23

sooooooo awesome.

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Ennui
Ennui

incredible work, best SP hl2 mod released so far

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Nokiaman
Nokiaman

This is best HL2 singleplayer mod after a long time!

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wolfcub
wolfcub

Amazingly fun, make sure to have a brain if you want to play it, very VERY intuative puzzles!!! My favorite part of HL2, the puzzles! But for combat fans, this doesn't disappoint so long as you enjoy the gravity gun. =D

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Brokenguns25
Brokenguns25

I learned about this mod from the steam news, so I decided to read about. After reading about it I concluded it was worth down loading episode 2 again just so I could play it.

I've now beaten it and I can honestly say without any doubt that this is the best mod I've ever played. If you're a fan of Portal you are going to love this mod. If you are a gamer this is a must have experience.

If you do not own Half Life 2 Episode 2, get it just to play this mod. This mod is that damn good! 10/10

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btnheazy03
btnheazy03

Incredible. Simply INCREDIBLE. The only criticism I have is WHY DOES IT HAVE TO END SO SOON? =)

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laserpanda
laserpanda

best singleplayer mod I've played. Only critcism is how short the game is.

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Cirdain
Cirdain

MOTY

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kaan88
kaan88

CAR BUG

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sixfour
sixfour

frogs

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Half-Life 2: Episode Two
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