What is the gold key in dig it up

Help
1

I was play dig it up and when I went to dig there was a golden key I collected I do not know its purpose

2

Umm this off topic plz close this or mark a solution

3

There are 10 and it will give you a secret ending.
BTW this is off topic so mark a solution to close it because this has nothing to do with GKC

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