Prehistorik is a platform game developed by Titus Interactive for the Amiga, Atari ST, Amstrad CPC and DOS. Titus Interactive also published it, and released the game in 1991.
The playable character is a neanderthal armed with a club. In a search for food, the neanderthal must hit dinosaurs and other animals that come in his way.
A sequel called Prehistorik 2 was released for DOS and Amstrad CPC. The sequel was also ported to numerous Nintendo systems and became a downloadable title for the Nintendo DSi in North America on February 15, 2010.
Source: Wikipedia, "Prehistorik", available under the CC-BY-SA License.