Mission 90: Place the device

Mission 90 for Kingdom Hearts 358/2 Days sends Roxas to Agrabah to plant a mysterious device for Organization XIII's devices.

Regular Mission
Place the device.

Story Summary
Still worried about Xion, Roxas is deeply troubled and begins questioning himself about who he really is. Nevertheless, he is sent on another mission, this time to Agrabah to plant a device.

Mission Walkthrough
Defeat Heartless in every room while traveling to the Lamp Chamber. Once at the Lamp Chamber, Roxas sets up a device in the chamber on behalf of the Organization. However, Heartless appear in an attempt to steal/destroy the device; Roxas must defeat them! The Heartless battle shouldn't be that hard, but watch out with the Land Armor. The Land Armor is highly susceptible to Aero magic. Limit Recharges, Potions and Cure Magic are a good idea Whittle away at his HP until you are victorious. After the battle is over, Roxas will immediately RTC in Mission Mode. There is an optional Invisible to face in the Secret Depths area. Jump up to the highest platform and it will appear. It is extremely weak against Fire Magic, but Thunder Magic will cure the Heartless.

Video Walkthrough
Video walkthrough here.