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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Cake_
Cake_ - - 86 comments

Wonder what the colours are for? Perhaps like batteries that you put in or something.

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Ennui
Ennui - - 420 comments

You know this mod has been released for like two years already, right?

Those color blocks are part of a puzzle. You put them in the right order (shown... light prism / rainbow order).

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Guest - - 689,368 comments

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