Hot Scramble consists of two very different styles of gameplay: Cockpit view shooting (it’s really an FPS) and side-scrolling action shooting. The beginning of each level puts you inside of the Z Gundam’s cockpit on earth, where they are flying along the ground and shooting at other Mobile Suits with a beam rifle.
My wife and I played Tri every chance that we had, and we weren’t even playing together. While one of us played the other would watch and make comments or criticisms. We helped each other learn the game, and in retrospect that may have been the biggest reason why Tri succeeded for me where Portable failed.