Room escape : 50 rooms chapter6 level7 (see how to resolve puzzle in description)
Chapter VI Chapter 6 level 7: puzzle: next row is 1) flip the order of above row, I.e from right to left of row above 2) take out the 2nd symbol 3) flip the color so derive the 4th row from 3rd row which would be the answer to the chest (answer show. In video )