i don't know about the dreamcast, but the ps1 version is quite different. it starts off the same on the crows nest, or at least very similar, but after he falls through and the movie plays, instead of him grabbing the poles and you collecting ammo, he flies (yep, he can fly in that version) down a big tunnel shooting things at you. you chase him with the shell and have unlimited shots to attack him with. but they don't do much damage, the real damage is when you deflect his heli-bombs at him, and also, when he starts firing homing missiles at you, you line them up so that when they speed past you they hit him and do lots of damage.