I would like to announce a new discussion forum, kindly hosted by the UK Puzzle Association. The reason this is not being hosted by the WPF is because the registration process to these forums is a big barrier to wider contribution to the discussion.

The purpose of this forum is to gather a collection of examples of Sudoku variants which are in some ways debatable. Please feel free to bring your own examples together with why you think the puzzle is or isn't sudoku.

http://forum.ukpuzzles.org/viewforum.php?f=33