Double score zone...
	Getting the most powerful Ston...

Go to the first level in any elemental zone. Find a locked gate with an arrow in front of it. Use any Toa's elemental power to blast through the gate. You will find a top secret double score zone.

Unlock the Stone Toa. In the Desert Of Sorrows get the Nuva upgrade. Note: Use the "Double score zone" hint to help. Then, find the mask in the end of Voya Nui Bay's first level. Where the Nuva Mask is normally found, there will instead be an Inika Mask.