How do you get to the chest with the big key in Arbiter's Grounds?

If I remember correctly you need the spinner and you go to a place in there called "spinner's paradise" (according to my cheat book) you have to get to the end of it and drop through a hole that leads to the big chest.

Remember the chamber that has spinner tracks on both sides of it? It travels to the east side...You have to use the spinner (of course) to follow the tracks, jumping from side to side to avoid the spiked spinners (using A to jump side to side), the exit from the spinner takes you to the Big Key chest, also known as Chamber #21.

You will have to go below to B1,B2 level, and work your way around to come in from the back. You will find a spinner that will allow you to float over the sand and /or to ride the side rails. Use the rails to cataput you over the wall to the rear entrance to the chest with the big key. It's gets a bit complicated but it's a fun ride once you learn to master the spinner. Hint: you can jump side to side by pressing the "A" button. Good luck and now on to the Boss. That's is where I have just gotten to. Oldtoad out... P.S. While underground be sure to switch back and forth from man to wolf often. If you suddenly began moving slow change to a wolf and hit your senses button. Use Midna's dark energy to get rid of the ghost rats and bugs.

You'll find the Big Key after you beat two Stalfos Knights...
Check your Map and hunt down the remaining Treasure Chests...