Dun Darach is an arcade adventure developed and published in 1985 by Gargoyle Games for the ZX Spectrum and Amstrad CPC computers. It is a prequel to the 1984 game Tir Na Nog. The plot has Celtic hero Cuchulainn on a search to find his companion Lóeg in the mysterious city of Dun Darach. Inspiration for the game came from the works of Fritz Leiber and Michael Moorcock.