In the game The Legend of Zelda: Ocarina of Time, one of the items you can acquire is the Gerudo Mask. This mask is required to access Gerudo Valley, a secret area in Hyrule that can only be accessed by those who possess the mask. To obtain it, Link must first find a guard at the entrance to Gerudo Valley and use a form of deception to convince him that he is female. After doing this successfully, the guard will give Link permission to enter and then provide him with the mask. Once Link has obtained it, he can use it to progress through Gerudo Valley and complete various tasks for rewards such as heart pieces or rupees.