QWOP is a physics-based browser game where players must control the movements of an athlete named QWOP. The game is named after the four keys that control the athlete's thighs and calves, making it one of the most difficult games to play. The player must use precise timing and coordination to make QWOP run a short distance, which is a challenging feat. The game is a humorous take on athletics and has gained popularity for its quirky gameplay and the difficulty of the controls. Despite its difficulty, players often find themselves drawn to the game and motivated to keep trying until they achieve success. QWOP is a classic example of a game that is simple in concept but challenging in execution, making it a favorite among gamers who love a good challenge.