Cheats:

 Start a normal game, and go to the options screen. Select SAVE GAME,
 then in any slot type:

 BUY A PLAYSTATION    Invulnerability, infinite energy, weapons
 WORLD OF FISH        Level select

 Then simply select QUIT TO TITLE from the options screen, start a
 new game, select men or women, and then the on screen instructions
 will take it form there.