CalmPlex MindBlockTM
Solutions Level 5
Numbers in (red) are
total solutions possible for that shape.

1 x 7 x 7 (40)
This 1x7x7 uses a 1x4x7 and a 1x3x7 which makes it
seem easy. But try to make it fully interlocking with
no sub shapes and you will have a challenge. Hint: It
cannot be done with all black corners.