Some NPC's will give you a puzzlebox to solve before they will give you the next clue or the reward. These can sometimes be difficult to solve.
A puzzle box is like a 'slide puzzle'. There are 24 tiles that slide and one empty space.
To move a tile, click on one that is next to an empty space. It will slide into the empty space.
To solve a puzzlebox, first figure out of which tiles go where. You can use the pictures below to help. Next start sliding the tiles into place, row by row.
Solve the first row across
Solve the second row across
Solve the third row across
Slide the four tiles in the bottom left corner into place
Slide the five tiles in the center and bottom right into place
NOTE: the bottom right corner will be the empty space