B.C. II: Grog's Revenge
B.C. II: Grog 's Revenge is a home computer game released in 1984 by Sierra On-Line for the Commodore 64, ColecoVision, ZX Spectrum, Amstrad CPC, Atari 800/XL/XE and MSX. It is the successor game of BC 's Quest for Tires and based on the comic strip BC by Johnny Hart.
The player controls the caveman Thor, who explore the surrounding area on his stone unicycle. Thor is on the search for the meaning of life and tries to explore it on different mountains.
The player controls the game character through the mountains and has to pick up shells. As in the comic strip, the shells are used as means of payment. In the game Thor must match the mussels another cavemen, Peter, pay to get to the next mountain.