I agree that the puzzles would be clearer with '/', rather than '÷' to show division.

Any indication incidentally in the '-' and '÷' boxes whether the two numbers have to be in the right order, across or downwards. In an across row, could a 2÷ be either (6,3) or (3,6)?

Tony Watson, Twyford,

Yes, and comments under "KenKen for adults (8-12): March 22" show several people including me are being fooled by this low-resolution division sign being indistinguishable from a +. The first three puzzles under "KenKen for adults: March 22" are much bigger and clearer (though if you use the Print button it splits the third one across 2 pages).
What happened to puzzles 4 to 7 by the way? Can we see those online?

Mike, High Wycombe, UK

I think in the cases of "2+" (indicating you have to use addition to reach 2) this is actually 2 followed by a division sign which when at low magnification may look like a +!

Heather, london,

You have misread the + It is a division sign so there are many ways of getring a 2. 6 and 3, 4 and 2

K Forward, Bristol, England

Peter,

If you look top right it shows what operators (i.e +, -, / and x) can be used in the KenKen, so it means there is more than one way to make 2. Thus resolving the difficulty you are having.

Oliver, London,

Whilst these do seem to be an interesting new puzzle, please can you explain Puzzle 10. In the third column, you have two blocks of two squares only, both going down (or up if you prefer), where the objective is 2+. This means that both blocks must have 1 + 1, thus giving four 1s in the same column. This breaks the rules of "all the digits 1 to 6 must appear in every row and column". In Puzzles 8, 9, 11, 13 you also have a block of two squares with the objective 2+. Again, this breaks the rules as the only possible way of achieving 2+ is by 1+1, unless maths has changed since I was at school.
If you do want KenKen to be a success, I respectfully suggest you correct the above puzzles.

Peter Sedgwick, Genova, Italy