This is in Conner by Castlewars, you must go East until you get to the end of the houses, go north of Sora's house.
(Read the signs of the last house on the row.)Then go north until you get to a big castle, and a small "Grass" hut on the right side. That says Castle Garden Quest at the top.Then go in that, and there will be a small maze. Read what the NPC has to say, start the even, and your timed. (Hint: If you don't do it the first time, hurry so the bushes don't respawn and you can run right through. It says not to go in with 2 people... but who listens to NPCs?). When you finish the race you will be warped into a room with a chest that contains a Heart Piece.
Mobile players, and players with lag should try to bring along another person to help clear bushes and complete this quest.
*Content on this page was taken from Splinky's Unholy Nation Guide and the FAQ Team that created the Unholy Nation Weebly Guide, and brought up to date by the current UN Staff team. Thanks to Rose, Haze, Gash, Jah and Splinky*, and all others who all worked hard to see the original guide to completion.