Follow these steps to get across the Ghost Bridge for the Urn of Sacred Ash quest:

1: Right one, right two, left three.

2: Player steps on first section of ghost bridge.

3: Right two, left three, left six.

4: Player steps on second section of ghost bridge.

5: Right two, right four, left six.

6: Right four, left one, left six.

7: Player steps on third section of ghost bridge.

8: Right four, right five, left one.

9: Right five, left one, left five.

10: Player crosses successfully.

Note that on the console version as each piece of the bridge becomes solid it remains solid permanently greatly reducing the difficulty of this puzzle.