A very enjoyable puzzle. Like some others, at first I didn't notice the special instruction, and found it difficult, but when I did notice it, suddenly everything got better. Fir several of the SI clues I had already thought of the right solution, but had been totally unable to think why. However, there's one thing which still puzzles me. Although I have filled in all of the solutions, I have only counted 10 specials. I can't see where the other two are at all.I have got 9,19, 27 ac & 3, 4, 5, 6, 18, 25, 27 dn. Any help on spotting which ones I've missed?