Eliminate the Windstorms.
Roxas must eliminate three Windstorms.
Head to the Halloween Town Square to take on three Windstorms at once and a host of Detonators. Don't waste your Thunder spells on the Detonators! Thunder spells can not only stun but also cause extra damage to the Windstorms. Your mission is completed once you have finished off the three, but you can continue to the Graveyard to encounter an Invisible. It watches over a Hi-Potion and a Shining Crystal in nearby chests.
|Challenge Mission 90|
Finish in record time!
|Take 50% more damage|
Enemy level +3
|3||1:00:00 or less|
Thunder magic will speed the battle way up. Equip a magic-boosting weapon, such as Crown of Guilt++, with all slots filled with Magic Unit Ⓛ, and link up as many casts of Thundaga LV5 as you can. Bring along Hi-Ethers or Elixirs if you don't have enough casts. Cast Thundaga on the Windstorms as quickly as possible. To give you an extra edge, also equip movement abilities like Haste, Air Slide, and Glide.
|Challenge Mission 90SP|
Avoid taking damage!
|Enemy level +20|
|3||5 hits or fewer|
For this Special Challenge, bring along many casts of Thundaga, as well as magic-restoring items. Keep your distance from the targets, using your map to keep track of their locations. Avoid close combat to reduce the risk of getting hit.
|Synthesis||Lightning Crystal||Halloween Town Square||Left of well (from entrance)|
|Thundaga Recipe||Halloween Town Square||Right of well (from entrance); on elevated area with gate|
|Thundaga Recipe||Halloween Town Square||Across form entrance|
|Shining Crystal||Graveyard||North of entrance; near right wall|
|Regular||Hi-Potion||Graveyard||Left of entrance; near left wall|
|Badges||Unity Badge||Halloween Town Square||In alcove; next to Graveyard entrance|
|Ordeal Badge||Halloween Town Square||Right of entrance|
|Ordeal Blazon||Graveyard||Next to chest containing Shining Crystal|
Video walkthrough here.