Instructions
Cross the extending bridge, then head west over the top of the gigantic cat towards the greenish mist.
Tap the "Hatter" icon on the DS' touch screen, then tap "Alice," then "Hatter" again. This will activate Hatter's Sprint, allowing you to run across the bridge.
Walk toward the "Hatter" icon on the right, then tap the "Hatter" icon on your touch screen. Tap the left icon to activate Hatter's perspective power, revealing stairs next to you.
Go up the stairs until you get to the second "Hatter" icon. Activate the perspective power again by tapping you the "Hatter" icon on your touch screen, then go up the rest of the stairs.
Walk through the door to exit the level.