This can only be done after you have gained control of the Airship. Return to the Sanubia Desert, there is a large rock with a picture of Cactuar on it. Each time you examine the rock, you will receive a clue to help find one of the 10 hidden Cactuars in the desert. After finding each one, you are challenged to a game of "Red Light/Green Light". If you successfully touch the Cactuar before time runs out, you will fight it.
No matter the outcome of the battle you will receive a Sphere bearing the name of the Cactuar. If you loose a game of "Red Light/Green Light" three times, you'll only receive a Sphere "del Prededor".
Return to the rock and place whichever Sphere you obtained in the rock. After doing so you will receive a clue telling you where the next Cactuar is hidden. Here are the locations.
Near the savepoint.
In an alcove to the East, north of the tent with the Save Point.
Search the sign near the Cactuar Rock that says "20% off".
Near the ruins to the West, look for two Cactuars running around in the desert.
Near the savepoint under the tent.
Located in a treasure chest to the far West part of the desert.
Inside one of the sand whirlpools. You must exit and re-enter the area.
Teleport back to the airship and go to the deck.
Return to the Cactuar Statue and it will appear behind you.
Once you have placed the 9 spheres into the rock, the sandstorm protecting the Cactuar Village will come to a stop. Look around the Cactuar Village and you'll find many special items.
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