Zelda: Link's Awakening remains one of the most beloved entries in the entire series, and it was blessed with an exceptionally brilliant strategy guide made for the German market – a guide which has now been scanned and preserved online by History of Hyrule.
Originally published in 1994, the guide is full of the usual information you'd expect to find but is accompanied by some utterly fantastic artwork, including multiple pieces by Katsuya Terada – miuch of which was never reprinted anywhere else. There's also a fabulous full-colour, hand-drawn map of Koholint Island.
You can see the scans here, and while non-German speakers will obviously struggle with the text, the gorgeous art is well worth a look.