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Dragon's Tooth Classic
From UamWiki
(The full list of Ages: List of Ages)
Author
Metabasalt
Walkthrough
(to read the spoiler, select it with your mouse or press "Ctrl+A")
There is a cubical stone in the upmost area, near the slide down to the cave, which links to Ordovician. On the one sign, there is a multiple-choice question. (Solution: limestone) Click the correct button to open the slab behind it, and take the ladder down.