A group of fans is releasing a mod for Portal 2 known as Portal: Revolution, which serves as a prequel to Valve's iconic sequel. This makes it a brand-new experience for fans, containing 40 brand-new and unique puzzles for players to solve, derived from Portal 2's mechanics. While the Portal franchise hasn't had a fully-fledged sequel in years, fans have been breathing life into the franchise with endless amounts of fan-made mods, which all take advantage of the timeless puzzle mechanics.