Remember those Game & Watch electronic cards that everyone thought were the bee's knees a few years back? They always had some simple task to perform, like closing manholes or collecting pancakes, and they repeated it infinitely, as it got harder and harder. Well, now you can relive those days with Cavemania! As Ug the Caveman you have to scarper across the 3 flip-screens of your island home to a Pterodactyl's nest, steal some eggs and bring them back for your dinner, on the way leaping the roaring river, dodging the erupting volcano, bashing the land-based dinosaurs with your club and chucking rocks at the flying ones before they swoop down and dump you in the drink.
Make it back with three eggs (you can only carry one at a time, and don't break it!) and you can proceed to the next island, with more water, more lava etc, etc. It may be wrapped up in small cute graphics and given the typical Shaw Brothers' polish, but very quickly it's z-time.
Harmless, pointless fun - the kind of game you'd play on a Sunday afternoon, when you can't face that English essay and your brain's running on auto.