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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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.


Simply fantastic. The level design is gorgeous, realistic, as well as being conducive to the puzzles, which appropriately take center stage here. Both unique and extremely fun. Perhaps the best HL2 mod ever made.


peegee1 says

May contain spoilers 0 agree 0 disagree

Still a big fan, played it many times and analysed it.
Wow, that's a real crazy well done job.


perfect work

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!


Just amazing. Best puzzle game I've seen using Half-Life 2's engine.

Best HL2 mod ever! Hopefully there will be a sequel.

Gotta love HL2 puzzles :Þ

Great level design and puzzles. Interesting story and narrative, very fun.

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