Caverns of Eriban
labyrinth shoot'em up game for Commodore 64, 1985

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As the Pilot of a mine supply ship, your task is to enter the Caverns of
Eriban to deliver supplies to the subterranean mining depots.
On the Planets Surface are five supply depots with chequered yellow landing
strips. If there is a white flashing light on top of the depot building you
can land and collect five supplies and refuel your craft.
Avoiding the many ancient defense mechanisms you must enter the caverns and
deliver the supplies. Any mining installation requiring supplies will be
displaying a red flashing light. Local flight control restrictions allow you
to only land on the yellow landing strips.
Once you have supplied five depots you will need to return to the surface to
restock with supplies.
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Some useful keyboard shortcuts
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[PAUSE] - stop/continue game
[F9] - quick load game state
[F12] - quick save game state (still stored after leaving the site)
[F11] - toggle fullscreen mode
[ScrollLock] - quick switch control ports
[PageDown] - make a screenshot (320x200)