Here are some cheats and tips for the game Clu Clu Land.
GXLILL Both players have infinite lives
GZPGSL Infinite time (stops timer)
PAGKGL Both players start with 1 life
APGKGL Both players start with 10 lives
TEYIGL Increase extra time
VTSKPLSA Player 2 has only 1 life
IEVISZZA Shoot more rays
AOVSOZAZ Shoot shorter rays
ASVSOZAZ Shoot longer rays
AASIAYGA Enemy can go thru gold bars