Picked at this game a bit...and it's almost working. Hold the button down in-game to move at double speed. There's still a slight problem due to the way that display scrolling is handled. It's executed apart from the normal movement routine...and then only when it has enough free time to do so. So adding double-speed to the player sprite might cause the display to lag behind a little on occasion (generally when moving Jr. upward...be careful not to let him cross the upper edge of the playfie