Press 'Space' to begin. Controls: 'Arrow Keys' to choose action. 'Z' (Mario) / 'X' (Luigi) to select option / do action. 'A' and 'B' in-game correspond to 'Z' and 'X'. Mobile: Tap left / right region of screen, to cycle commands. Tap center of screen to select command. Tap up / down region of screen, to choose enemy. Tap center of screen to select enemy. To do 'Bros. Move', tap with good timing.
