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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Amazing visuals (great detailing), awesomely fun gameplay and perfect puzzles! I loved it, one of the best mods ever made!

Really great atmosphere and puzzles. Love the factory and warehouse theme throughout and great mix of puzzles and (a small amount of) combat.

very nice mod love the look of the base and the puzzles, the ending made me leave with a smile :) 9/10 wish it had more weapons to use and more npcs to fight but at the end of the day it's a puzzle mod, if love half life download this mod :D

Very fun!


As much as I love the concept, programming and the game as a whole itself, I hate the small "improvised" car towards the end 'cos for me it was almost uncontrolable (not WASD setup) and I got sick from whirling.

Very good job. The puzzles are really well done and very original. None of them is brilliant or very difficult but they are very close to it. Congrats.

Very, very fun mod. The puzzles are excellent and very creative. The puzzles are of equivalent quality to those in hl2, and occasionally much better. Although the description says the mod is puzzle based there are sections of combat that are as pulse-pounding as any in hl2. Hurl mines at enemies with the iconic gravity gun, careen through hazards in a runaway train car, and shred through enemies with an original vehicle unique to this mod.
My only complaint is that the health gauge on the HUD is gone, making it hard to keep track of your nonregenerating health (though because of the way the mod is designed it very rarely mattered). Also, the vehicle is occasionally hard to steer.

Very creative and fun, but pretty short. A few times the puzzles are frustrating because it's not clear what you should be even trying to do.

But overall it's nice to play something that's unique and not derivative. Great work!

A fun mod that requires quite a lot thinking if you want to pass it. 1 minus point for the long and arduous train rides that took a little bit longer than what was fun..


Just, plain, great.

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