HIDDEN MESSAGE: There is a way to trigger a hidden message 
                      (a security feature perhaps?). It may have something to 
                      do with the connections of the bus sub-board. When triggered, 
                      the message "MADE BY NAMCO" appears, spelled out 
                      in red dots on three horizontal rows, filling the screen.
                   
                   
                    Hiding spot  At the start, go left and up first channel 
                      and stop. Make sure no monsters see you doing 
                      this.
                   
                   
                    BUG: Kill screen - After level 255 (243rd key), the famous 
                      split screen appears (board 0 - byte rollover 
                      phenomenon). 
                   
                   
                    RUMOR: Its possible (?) to avoid this if your score 
                      at the end of level 254 contains the sequence 255 
                      at any position in your score. Youll then return to 
                      the cherry board, except instead of a cherry in the lower 
                      right corner, there will be a broken key in both lower corners. 
                      None of the monsters will turn blue. Two additional split 
                      screens occur- one the 366th key, and the other somewhere 
                      in the 460s.