Konami Collector's Series: Arcade Advanced
At the Frogger title screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, Start for higher resolution graphics.
At the Gyruss title screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, Start for higher resolution graphics.
At the Rush N' Attack title screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, Start.
At the Scramble title screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, Start for higher resolution graphics.
At the Time Pilot title screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, Start. A prehistoric level will appear during game play.
At the Yie-Ar Kung Fu title screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, Start. The bonus fighters will be unlocked after a single player game, or may be immediately selected in versus mode.
