The Chocobo Hot and Cold Game

Starting the game
Talk to one of these NPCs:
 * Collione: Southern San d'Oria (I-10)
 * Keturah: Bastok Mines (I-9)
 * Bwi Kaghonsa: Windurst Woods (K-12)

The NPC will babble on and eventually you should receive a Tandjana Wildgrass item and some Key Items.
 * Key Items: A Prairie Chocograph and a Bush Chocograph.

After receiving these items, take a look at your Key Items to determine what area you would like to search for treasure in. Go to that area and use your Tandjana Wildgrass. After using it, you will be placed on your chocobo and you will be shown a map with a "???" marker. You can review the location of the "???" marker on your area map (/map) by switching to the green marker tab. Proceed to that general vincinity and proceed to dig. You do not need any Gysahl Greens to dig.

At this time, I have not attempted to dig from very far away from "???" marker. Also, I have not purposely failed to determine what occurs.
 * Note: You cannot change area with your chocobo while doing the Hot and Cold game.

Digging Messages
You will receive one of four messages when digging: The first message is equivalent to "very cold" The second message is equivalent to "cold" The third message is equivalent to "hot" The four message means "keep digging" After 5 or 6 dig attempts of the fourth message you will receive the following message:
 * Kweh.
 * Kwehhhh!? (The treasure is close!)
 * K-KWEHHH!!! (You're right on top of it!)
 * K-KWEHHH!!! (You're right on top of it!)
 * Kweh! Kweh! Kwehhh! (You've found a treasure chest!)

A "VCS Crate" will spawn where you dug. You need to dismount from your chocobo to open the chest.