From the inlay (ZX Spectrum Bug Byte Release):
Here's your chance to play a part in the formation of history. Help Fred build his house and win the heart of Wilma this paving the way for Bedrock as we know it today.
The first screen consists of a desolate landscape with boulder that will enable Fred to build his dream house. Smooth, round rocks are ideal building materials, whilst jagged rocks will prove a hindrance. Putting the roof in place will require a visit to Dino-Hire.
Fred must also be mobile, so help him find a car so that he can venture further afield to find more rocks and hopefully run into Wilma at the same time.