Press any button to join (this will be your primary button). Then press another button (this will be your secondary button)
Primary Button - Select currently indicated button
Secondary Button - Leave Game (removes the set of controls for the player that joined)
Primary Button - Row Selection: Select a row
Item Selection: Select currently indicated button
Secondary Button - Row Selection:
Item Selection: Go back to row selection
Was working before adding multiplayer and menus, currently broken sorry.
Primary Button - Game: Progress through turn
Pause Menu and End Screen: Select currently indicated button
Secondary Button - Game: Pause Game
Pause Menu: Current Player only - Undo (return to last state; works during power select; can be used only be used x times during player switching after a firing and the ball stopped moving)