Tir Na Nog is a video game published in 1984 by Gargoyle Games for the ZX Spectrum and Amstrad CPC. It was ported to the Commodore 64 in 1985. It is loosely based on Celtic mythology.
The game was widely positively received by the gaming media. The game forms part of an unofficial trilogy with the science fiction title Marsport and Dun Darach. Dun Darach is a direct continuation of the Cuchulainn storyline, whereas Marsport shares only the game engine.
The game has many features that were groundbreaking in 1984 such as a large central character, animated backgrounds and parallax scrolling.
Psygnosis Software planned to release a PC remake of the game, helmed by the game’s original creators Greg Follis and Roy Carter, in June 1995. However, though near completion, the project was canceled.