Sudoku3D
Sudoku in three dimensions.
Nine boards connected in three dimensions — rows and columns continue across boards.
867176892397
87366324571265844813
17327561696758258
9861398252831765939614541178376
67152174976536198167
7645611898175248761458385521724
63459396318384531
49189457936538177461
439638245428