 Newton 2 is a NoLimits 1 add-on created by Entropy that allows you to create roller coaster track based on forces rather than shaping; This method of track building is commonly referred to as "Force Vector Design".This is where you specify the g-forces you want to achieve and then Newton 2 will shape the track to achieve those forces.Several other programs are also designed for NoLimits, such as "NoLimits Construction Kit" and "NoLimits Elementary".