Time Passenger I: Prehistoric Adventure

Professor Van Hursen must travel back in time to obtain the keys that will open a mysterious ark. This game was given away with each issue of Computer Gaming World magazine and was part of a contest in which a computer was raffled off among those who managed to complete all the games. At the end of each game, a key phrase was obtained that had to be sent; whoever collected all of them entered the raffle for a computer and other little things.