The game does offer a quick control change option if you wish to play on an arcade stick and there is also the option to completely remap all of the buttons to your liking. And L1 is for the aforementioned communications button that can either send preset quick messages to your ally player partner or to change the AI behavior of your partner in the single-player modes. L2 is for your Special Projectile (Square+Cross). R2 is mapped for the Special Melee attack (Triangle+Cross). R1 is reserved for the Sub Weapon attack and is a shortcut for Square+Triangle. The shoulder buttons are shortcut options for alternate commands that require combinations of the face buttons to be pressed at the same time. Square being your primary projectile attack, triangle for melee, cross for boost and circle to switch targets. On the PS4 controller, these are all mapped to the face buttons.
Five if you count the one for quick communications. The Gundam VS games have mainly used four buttons. The directional buttons and left analog stick work well enough to control your character but I do recommend using the directional buttons to avoid any miss-inputs when executing certain commands. The theme song for Maxi Boost ON is titled 'No Future. This update introduced even more mobile suits and characters along with balance changes. Maxi Boost ON ( ON), was released in arcades on March 9, 2016. Since this is a port of the arcade game, movement is limited to an 8-way digital arcade stick. A further update, Mobile Suit Gundam: Extreme Vs.