Can you solve it? Clueless sudoku

Puzzles where less is more

UPDATE: Solutions now available here.

Sudoku is an extremely elegant puzzle, and this crucial to its appeal. The rules are simple to understand and the grid - with given numbers usually presented in a symmetric pattern - is striking. Yet perhaps Sudoku is not elegant enough. Perhaps the numbers on the starting grid are an unforgivable blemish, a needless sullying of the page.

Or so argue a group of mathematicians, who have come up with a new puzzle genre: clueless Sudoku', which are Sudoku-style puzzles with a pristine starting grid. These puzzles literally don't have a (numerical) clue.