Easter Egg :
1) Enter service mode.
2) Set coin A to 1 Coin / 1 Credit, set coin B to 1 Coin / 4 Credits, set Freeze to On, set Lives to 1, set Difficulty to Rank C, set Demo Sounds to Off, set Level Select to Off, set Bonus Life to 10k.
3) Press the service switch to display the grid and press (all together) Right+Button1+Start2.
4) '(c) NAMCO LTD. 1984' will appear on the screen.