The Ultima Cannon is a spring grenade cannon. Its Cannon Rockets are similar to spring grenades. The Ultima Cannon may look cool but is weak as a weapon since it only deals 20 damage and has 1.3 Rate of Fire. It is not recommended to buy this weapon for combat. The Ultima Cannon is only good for Rocket Jumping.
The Ultima Cannon is only available for credits with prices of 350 credits per day, 1470 credits for a week and 10500 credits for permanent use.