Blueberry

Blueberry the famous cow-boy in the cartoon is confronted by the ghost with the golden bullets. A mad race across the desert, attacked by indians, rattlesnakes, Luckner the traitor, and suffering from thirst, leads our hero and his companion in adventure, Jimmy Mac Clure, to the gates of an old Indian village, abandoned, or almost so... Hidden in the crevices of the dried out plateaux of the Grand Canyon, the ghost is on watch... You are the director, script writer and actor in this great rhythmical adventure game of scenes of action with numerous and superb graphisms.

Source: Back of Box - Amstrad CPC (Multilingual)