Most games are fast-paced and chaotic. Bodies often explode in a spectacle of blood and body parts, sometimes being hurled clear across the map. Besides its ragdoll physics, the game's engine, written in the Borland Delphi programming language, employs realistic concepts such as momentum and gravity. Fall damage and recoil are also taken into account when Realistic Mode is enabled, and supply crates, dropped weapons, and grenades realistically tumble down steep hills; another effect is the flag's realistic waving as a player runs with it.