Research_and_Development_(mod)
Research and Development (mod)
2009 Half-Life mod and puzzle game
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.