Research and Development is a mod for Half-Life: Episode Two created by mbortolino. It switches the whole game from FPS to first person puzzle game. You’re unarmed most of the time and your goal is primarily to solve inventive physics puzzles. It’s a wonderful mod – polished, with lots of fresh ideas and great atmosphere.
How to install:
Extract the archive to „...Steam\steamapps\SourceMods” folder. Then restart the Steam client and the mod should be listed among games.
If the mod won’t work, then go into it’s folder (it’s in the SourceMods) and find the gameinfo.txt file. Open it in Notepad and look for the line starting with “SearchPaths”. Then highlight and everything below, right till the end o the file and replace it with this:
Report problems with download to [email protected]