Cool Math's "Red Ball 4" is available at CoolMath-Games.com, Kizi.com, NotDoppler.com or PhysicsGames.net. Each site offers one or more volumes of the game and a Flash-based graphical interface for playing.
CoolMath-Games.com has the first three volumes of the game and includes simple instructions on how to play. The Kizi.com play screen opens with an animation of the site mascot. Press the Start Game button to navigate to the "Red Ball 4" introduction screen and begin playing. NotDoppler.com features a brief description of the game and selected game specifications. PhysicsGames.net offers Volumes 2 and 3 of "Red Ball 4" as well as an embed code to include the game on the player's own website.