To solve this you need clue cards J and K. If you do not have all these items yet, find another puzzle to solve.

Look at the first letter from clue card J. The shape of the black lines directs us to the bottom left of clue card k and the dot in the middle tells us it's a "T". For the second letter we need the top right of clue card K and the dot again is in the middle giving a "H". Continue to work through the code in this way. The first word is "THE".

The message reads:"The correct combination is four two three nine" (4239). Type the answer in the box above to proceed.