During play type any of the following:
"DAWAJ MI PLANSZE"-----To skip levels
"PRYSZCZ CI W OKO"---For invicibility
"LENINJESTWIECZNY"--Top of life meter
"ILE WOLNEGO RAMU"-----------Not sure
"TRYBUS SPECJALUS"-----------Not sure
If you type the last one in and the screen turns to garbage press 'RETURN' to get the screen back and use the function keys while the screen is screwed up to alter the screen (sort of like the 'm' and 'n' keys of the Action Replay freezer).