Viaje Al Centro De La Tierra Trivia (Atari ST)
missing cover art
8 bit extended versionsAmstrad CPC and ZX Spectrum versions lack stages 4 and 5, due to time constraints. 20 years after the game release creators Alfonso Fernández and Manuel Ferreira released new finished versions, available at ComputerZone.com.
A C64 version of the game was also announced in 1989, but was definitely cancelled and is not likely to ever see the light.