Codewords:

Level 2: 0007
Level 3: 3675
Level 4: 9025
Level 5: 9025
Level 6: 1813
Level 7: 3353

Codewords by Arne Beilschmidt - Beilschmidt@T-Online.de
Corrections by Stephan Aigner - x.mail@t-online.de