Dunjonquest: The Datestones of Ryn (1979)

Given a time limit of 20 minutes you are sent into a cave to retrieve the stolen Datestones of Ryn.

Storyline

A band of thieves under the leadership of the infamous robber Rex the Reaver sneaked into the tower of the capitol of Ryn to steal the duchy's most revered possessions, the foundation of the ducal calendar: the Datestones of Ryn. Persecuted by Capatain Morpheus and its cavalry, the band of robbers is finally located in their hideout in the Haunted Mountains. But time is short, there is rumored to be a second secret entry to the cave and the sunset is not far, giving the thieves an opportunity to flee under cover of the darkness of the night. It is decided that you Brian Hammerhand, the least senior officer of the cavalry troop, will embark on a stealth mission trying to retrieve the stolen Datestones of Ryn and posssibly even bringing the head of Rex the Reaver...