Trackballs have also been regarded as excellent complements to analog joysticks, as pioneered by the Assassin 3D, a trackball released in 1996 with joystick pass-through capability. Later in 1996, Mad Catz released the Panther XL, which was based on the Assassin 3D. This combination provides for two-hand aiming and a high accuracy and consistency replacement for the traditional mouse and keyboard combo generally used on first-person shooter games. Many such games natively support joysticks and analog player movement, like Valve's "Half-Life" and id Software's "Quake" series. , one professional eSport player was known for using a trackball.