I know U Probably Figured This When You Went To Gerudo Mesa, But Stand In Front Of The Big Thing Sticking Out The Ground And Move Until Minda Laughs, and the up thing appears. Then Warp It to the bridge of eldin and the bridge will be fixed! Warp back to gerudo mesa and the hole will reveal the enterance to The Cave Of Ordeals.
A 50 floor Cave With Increasingly hard rooms (1 room per floor) every 10 floors the great fairy will relase fairies into the springs. (Ordona, Faron, Eldin, Llanaryu) and then when all 50 floors are completed, the great fairies turns the spring water into fairy tears so you can fill a jar and get health and a small attack boost!
It is Extrmely Hard With Rooms Such As Filled With 5 MASSIVE CHUS! Which Cut in half, then in half again, then into quarters!
I have so far completed 20 rooms.