The video game console versions had 3 additional levels. In the arcade version, the 5th level is an exceptionally long last level. The disparate elements of it were expanded in the console versions to form 3 additional levels.
Nintendo NES (dec.28, 1990) "Probotector [Model NES-77-EEC]
Microsoft XBOX 360 [XBLA]
Nintendo DS (oct.26, 2007) "Konami Arcade Classics [Model NTR-ACXP-EUR]
Nintendo DS (oct.29, 2007) "Konami Arcade Classics"
Sinclair ZX Spectrum (1987)
Commodore C64 (1987)
Amstrad CPC (1987) [64 ko version] : FX only.
Amstrad CPC (1987) [128 ko version] : FX and Music.