Follow these steps as young Link to obtain the Mask of Truth, which allows you to talk to the gossip stones:
1. Sell the Keaton Mask to the guard at the foot of Death Mountain. 2. Sell the Skull Mask to the Skull Kid in the Lost Woods. 3. Sell the Spooky Mask to the young boy who plays in Kakariko Graveyard. 4. Sell the Bunny Hood to the Marathon Runner in Hyrule Field. Make sure you have an empty Giant's Wallet! Now return to the Happy Mask Shop and the Shopkeeper will let you borrow ANY mask for FREE!