In several games, especially first-person shooters, game glitches or physics quirks can become viable strategies, or even spawn their own game types. In id Software's "Quake" series, rocket jumping and strafe-jumping are two such examples. In the game "Halo 2", pressing the melee attack button (B) quickly followed by the reload button (X) and the primary fire button (R trigger) would result in the player not having to wait for the gun to be back in position to shoot after a melee attack. Doing this has become known as "BXR-ing".