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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This design... its very achievable to finish this game without having to cheat. its completely fair

Very fun!

Wow. Research & Deveopment is quite an achievement.Logical puzzles that are hard but are solvable within context.Graphics, sound, story, all A+. Excellent job!

First time I've seen a mod like this. I hope there are a lot more.

Purely amazing

Perfectly paced.
Amazing Mechanics
Well placed Humor
Challenging and unique Puzzles


The first time I saw this mod I wasn't very interested but it turned out to be fantastic. The mapping was great, the puzzles were amazing, there were subtle bits of humor in there, and I was having tons of fun playing it. This is a unique mod experience that nobody should miss out on. You get a well deserved 10.

I like the puzzles and the part where you have to build your own car!

great work, one of the best!

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