This game has debugging material.
- Press and hold the Service Credit button as soon as you power the board on.
- When the SERVICE SWITCH ERROR screen appears, immediately release the Service Credit button (you have 5 seconds to release it or the Easter egg won't work).
- Then press Start (x3) followed by the Service Credit button once followed by Start for a final time.
Use P1 Down to select the starting round (1-6) then P1 Start to start the game. You'll start the game with 255 lives, although the game can only show a maximum of 99 on screen so it will show 54 to start with (255 minus the one you're currently playing with) but it will still maintain the correct count of lives internally. Also the high score is set at zero when the egg is activated (rather the usual 50000).