Invincible Island ZX81 Edition -ZX81-

 by Mancave Software

 

 This is a port of the 1983 text adventure "Invincible Island" by Peter Cook for the ZX Spectrum. Due to memory limitations there are some differences between this and the original 48k Spectrum version. Despite this, all the locations with their original descriptions are present, as are all but two items. Overall I would say 95% of the original game is present and it retains the same feel as the original.

Download, here

Source: https://mancave.itch.io/invincible-island