The Boulder is a chassis with a spherical shape. Its round form makes it recover easily when flipped, and has a small size suitable for Blade builds.
One effective strategy with the boulder chassis is to pair it with blades and boosters, as its round shape will allow it to jump and roll over most machines. The height of the jump is dependent on the type of wheels used by the machine.
An excellent defence against booster boulders is to install a repulse on a front sloping vehicle, as it will push the boulder upwards, making it fly upwards, and jump over the arena walls, which will destroy the boulder.