When the screen says push fire to start, type "GOLDFISH". Now use the following keys:
'F2-F5'--Advance to the corresponding level
'1'---------------Will make zool invincible
'2'-------------Advance to the next section
'3'----------------------Skip to next level
'4'-------------------Removes invincibility
Try any of the following for various messages:
"ADE" | "TONY" | "GEORGE" | "SYD"- | "SHORTIE" | "BERNI"
"PAT" | "PAUL" | "CASSON" | "ASH"- | "RITCHIE" | "HILEY"
"SIZ" | "MARK" | "GREGGS" | "MICK"
For a bonus zone on level 2-2, play these notes on the first piano; Brown, Yellow, Red, Orange, Green.