I was going to start a thread on German-language Amiga software that hadn't made it to the UK, then realised this one existed.
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Tricky Quiky looks a fun platformer that can be played without German language knowledge.
Lemon Amiga lists 456 games released in a German language edition
(I'm not sure how to exclude English from the search). Are there other games that an English language audience would likely have missed?