Welcome to Project-GC Q&A. Ask questions and get answers from other Project-GC users.
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You could try using existing challenge checkers and try different people, for example:
https://project-gc.com/Challenges/GC7KWG4/34450 - checks for 1 cache above 3000m and
https://project-gc.com/Challenges/GC5EGQW/6140 - checks for 1 cache above 4000m