Bazooka

The Bazooka is an upgrade for Tails in Sonic Adventure 2. It allows the Volkan Cannon to break metal boxes.

It is found in Eternal Engine. In an outside segment, you will encounter two switches that will open the same door (one is incase you fall.) Beyond the door is the upgrade. It is required to beat the level, as well as get the Laser Blaster.

Its equivalent is Eggman's Large cannon, also required to beat its level and get his Laser Blaster.