1. *Purchase (or mine) a normal Dragon Gem, Phoenix Gem, Kylin Gem, or Rainbow Gem in exchange for a Silver Needle.
*Purchase (or mine) a normal Fury Gem, Moon Gem or Violet Gem in exchange for a Gold Needle.
2. Head over to the NPC (Old Miner) outside of Phoenix City mines, located just above the NPC which is used to enter the mines. Speak to the Old Miner, and exchange your gem for a silver/gold needle, accordingly.
3. With needle in inventory, search the sub-floors of the mines for a Blue Mouse, and once found, successfully catch him to claim your prize.
4. Head over to Twin City and speak to General Judd, whom is located at the extreme top left of the Twin City map, to claim your prize!
Step 1: The first and utmost important step is to purchase the gem(s) according to whichever needle is desired. In purchasing the gem(s), keep in mind that the end result should "earn" you something. I've personally found that there are only 3 gems worth purchasing/using. For the silver needle, purchase/use either a normal Phoenix or Kylin gem. For the gold needle, purchase/use only the Moon gem.
The needles do in fact make all the difference. The silver needle, although providing less chance of success in catching the mouse, may drop 1 or 2 items, at most. The gold needle on the other hand will always drop the 1 item, which is obtained only through the gold needle. In addition to this item, the gold needle may also drop any one of the first two items, or even all 3 by chance!
There are 4 possibilities in all for the items dropped:
-RoyalSword (The 1 item obtained only through a gold needle)
From what I have observed both through the forums and through personal experience, here are the list of prizes:
-Asternecklace: 1 Met
-PinetumPicture: 1 Met <--- Posted on a previous thread.
-RoyalSword: 5 Mets
-Aster & Pinetum: 2 Mets
-Royal & Pinetum: 6 Mets
-Royal, Atre & Pinetum: 9 Mets
-SecretCommand: 10 Mets
Sep 2: Pretty self-explanatory, although make sure you read the Old Miner's message at leact once. Also, you may only obtain one of each needle at one time. In other words, you cannot obtain multiple gold and silver, and will need to re-visit the Old Miner whenever you wish to obtain another needle. You can however bring along with you as many gems as you wish to, and simply keep re-visiting the Old Miner upon completing the quest once.
Step 3: This is where the frustration begins. Once understood, finding the mouse becomes the easiest step involved in the quest. The toughest obstacle of course, is successfully catching it! I've tested this over and over again, and have come to the following conclusions...
Step 4: Congrats on catching the little pest, and head on over to Twin City to claim your pirze. There is however a very important note I should point out: Do not claim your prize unless you are completely fullfilled with the items dropped. If for instance you used a silver needle, and obtained only an AsterNecklace, remember that you can store that item in your inventory and restart the quest with another gem to obtain the other items. I have done this numerous times myself, seeing as how if the silver needle gives me both the AsterNecklace and PinetumPicture, all I need remaining is the RoyalSword (gauranteed through just 1 gold needle) in order to claim 9 meteors! Completely worth it in my opinion!