Break the code

How to Play.
The code is a 16 digit number containing the digits 0 to 9 and lwtters A to F.
No digit is repeated in the code.
Tap the digits in the lower grid to make your guess and tap Go to score. Tap DEL to delete the last digit entered.
The colour turns green for a correct digit in the right place.
The colour turns brown for a correct digit in the wrong place.