Travel to the center of the earth, based on the book by Jules Verne has seen two games made on Amstrad CPC :

• Viaje Al Centro De La Tierra by Topo Soft, a video by Retro Danuart, an action game released in 1989 with 3 independants levels
• Voyage au Centre de la Terre by Chip, video by Amstrad Maniaque, an action game released in 1988

In 2012, an extended version of Viaje Al Centro De La Tierra by César Nicolas Gonzalez (CNGSOFT) was released with 2 additional levels.