Requirements for opening the secret cave door (Image via Roblox) You'll need three minerals to open the secret cave door in the Crystal Caverns: Diamond, Emerald, and Starshine.

Usage of Frog Key in 99 Nights in the Forest The door that leads to the Frog King's chamber (Image via Roblox) The sole purpose of a Frog Key is to open a door that leads to the Frog King's chamber.