Research and Development (mod)

Research and Development
A screenshot showing a vehicle the player must build to complete the game
Developer(s)	Matt Bortolino
Engine	Source
Platform(s)	Windows
Release	July 17, 2009
Genre(s)	Puzzle

Research and Development is a free mod for the first-person shooter video game Half-Life 2: Episode Two. Developed by Matt Bortolino and released on July 17, 2009,^[1] it is a non-violent first-person puzzle video game, and has been compared to Portal. It received critical praise for its unique gameplay and high development quality.