Repton 3 was the third in a series of Boulderdash like games released by Superior Software. The games were originally made for the BBC Micro computer.
The original game was written by Tim Tyler.
Repton was also made for the Spectrum and C64. Repton 2 was also made for the Spectrum.
Official Version
Repton 3 was advertised for the Amstrad CPC, but at this time it remains Vaporware.
Unofficial Version
In 2008, Arnoldemu started work on a conversion of Repton 3 to the Amstrad CPC. The official version did not surface, and being a fan of the Repton games (having owned them on the BBC Micro) he decided to make a conversion.
The conversion was progressing well, and then he contacted Superior Software in order get their permission that he could distribute this version for free. Permission was denied and development was stopped. This version will not be released. So even the conversion stays Vaporware.
Links
Tim's website: http://timtyler.org/ 3 on wikipedia