There’s another stealthy giveaway by GOG: The Dark Eye: Chains of Satinav. About 2 days left as of now.
This has one of my most favorite puzzles ever, the three “impossible” tasks in the Faerie Realm. Mild spoiler: the laws of nature behave differently there, making for some excellent moon logic 
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And, of course, it’s set in the wonderful, low fantasy, The Dark Eye universe (no prior knowledge required), so highly recommended!
