I joined just to correct this. The correct answers for 4 and 5 are Puzzle 4 4, E, 6, F, 4, E, 6, A, 5, B, 6, E, 5, A, 6, F, 5, B, 2, A, 3, B, 4, C, 2, B, 6, E, 5, C, 2, D, 3, E, 5, C, 3, F, 6 Puzzle 5 B, 4, C, 3 I just confirmed these for myself. Next time, could someone put up some warnings if it doesn't work?