
Developer mbortolino has released 'Research and Development', a Half-Life 2 Episode 2 mod now available for download.
The title is more puzzle-centric than your typical HL2 mod, described as a enviromental adventure game.
Of course you must own Half-Life 2 Episode 2 to play the game, the client download can be found mirrored on GamersHell.
From the description:
R&D’s hook is that it’s essentially non-combative. Yep – you go without guns throughout (bar the ol’ Gravity jobbie, but hey, that’s more about construction than destruction here). Sure, you can tell an Antlion to claw someone to death or arrange to squash men with falling girders, but you’re definitely not Edward Pistolhands. It’s an environmental adventure game, taking the irregular physics and logic puzzles seen in HL2 itself and turning them into the game itself. Mazes, gravity, exploding microwaves and fire-retardant antlion carapaces all make an appearance – it’s very much a point’n’click adventure in an FPS engine.