discover and their relevant keys are -

Yellow Circle - use Bernstein (German for Amber and can be bought
from the Shop in Twinlake)
Brown Circle - use Earth Stone (find in the southwest area)
Multi-Coloured - use Rainbow Stone (find in a Chest in the
northeast)
Blue Circle - use Topaz (? found on your travels elsewhere)
White Circle - use Diamond (find in Pharaoh's Tomb, Grave area)
Green Circle - use Emerald ditto
Red Circle - use Ruby ditto
Light Blue - use Mountain Crystal (? found somewhere)

I apologise for the two stones whose source I don't know. Frankly
until you enter the Swampstation you haven't a clue that the
Stones have a purpose and can't be sold just like the Gems can. I
was storing them up for a rainy day and didn't realise their
significance.

Other rock areas can be cleared with a Spade in one instance and a
Pickaxe in another. In the far northwest is reference to the Rune
chart that came with the game. Rather irrelevant halfway through
the game! In the northeast is a Chest that contains a Paper that
gives you the Keyhole/Key relationship described above. There
aren't many Rats to fight, roughly three sets in the northwest,
one in the northeast, one in the centre and two in the southwest.

The Map locator is found once both sets of rocks in the south
passage are cleared. "Action" it to place it in the grey window
and from now on it's much easier to find your way around the
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