Gameplay: The player's ability to move quickly and jump high is affected by the stamina system. Stamina is usually lost when running or jumping, but being injured by weapons also does a toll on it. How much stamina lost is affected by several factors, such as the player class being used or the weapon currently being held. Smaller classes can move quicker and regenerate stamina faster, but they cannot run with heavy weapons or they will tire quickly. Larger classes, although much slower and bigger targets, can move with heavier weapons with more endurance.