This guide shows where you can use all the keys on both maps.
 
I thought it would be useful to share this with you and I hope this helps you a lot!
 
 

Keys on Bright Sands (Normal Map)

Credits: @YamEatsYam
 
 

 
 
 

Keys on Crescent Falls (Hard Map)

Credits: @SeWa
 
 

 
 

 
 
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