zelda-skyward-sword
In Skyward Sword, after getting the Water Dragon Scales and talking to a Kikwi called Yerbal in the top of the great tree, I need to complete a incomplete symbol to open a door to the last unexplored area.
I've found the completed symbol, yet when I do a skyward strike on the incomplete symbol, nothing happens.
When you stop walking, the pumpkins move on the opposite side you were walking just before stopping (even if it was just an instant). Forward speed has no effect.
The trick is to go towards the shed and stop a moment before the pumpkins fall. Then just tap the direction in which they are falling and watch them going back to the center. Restart walking to the shed.
Those chests are scattered all over the world above the clouds, and can only be opened by activating the corresponding Goddess Cube in the the world below the clouds with your Skyward Strike. Once you do that the chest changes colour and can be opened. When a chest has been activated by a cube, it will show up on your map as a rectangular shape .
This is a Goddess Cube:
Here is a map containing the location of two activated chests (indicated by the rectangular blue symbol):
Here is a picture of an activated chest, which is now able to be opened:
(images taken from: http://www.ign.com/wikis/the-legend-of-zelda-skyward-sword/Goddess_Cubes)
Best Answer
To draw on it, you need to Fi to acknowledge that you have found the symbol template. Then go to the incomplete symbol and hold your sword up and do not do a strike! Instead you must let it charge, and go up to the symbol, then after a second or two you can draw to finish the symbol. It is similar to the process that you use for the Goddess Walls.