Cover of UK1: Beyond the Crystal Cave, showing adventurers entering a sparkling crystal cave with a frozen waterfall in the distance.
https://files.mastodon.social/media_attachments/files/109/441/586/774/860/701/original/3ce54e994f6d0690.png
The emphasis on thinking and clever strategy over hack and slash was a hallmark of the UK modules produced by TSR at the time, such as Beyond the Crystal Cave, which can be played to the end with no fighting at all! (I've posted about this one before.)
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