This challenge is from The Legend Of Zelda: Echos Of Wisdom. During the boss fight with Echo Ganon, you have many options on how to vanquish him. I chose the method of destroying him with only rocks. Nearly broke Zelda's lower back in the process, but we got it done. Interesting challenge that I'm not sure I would recommend to anyone. You can see how your stats stack up to mine though:
Time: 26min 24sec
Rocks: 206