BLOCK B Park Kyung, solved problem in 12 minutes while doing "big things" in the toilet.

* Picture(1) The upper plane increases by 1, 2, 3, 4, 5, 6 by "+1".

* Picture(2) The invisible bottom surface increases by 1, 2, 3, 4, 5, 6 by "+1".

* Picture(3)indicates that the first side of the die is invisible "4", the second side of the die is visible "3". The difference is 1. The second third difference is 2. Increase by 3, 4, 5 by "+1" like this.

* In other words, anything is correct for "?" If the left side is "●" dice.

* Dice also needs "knowledge" that the sum of figures on one side and the figures on the symmetry side always "7". The symmetry plane of "3" is "4", the symmetry plane of "2" is "5", and the plane of symmetry of "1" is "6".