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Colour Sudoku

I've launched a fun side project - Colour Sudoku (ed: now closed), a new type of sudoku puzzle where you have to place the numbers 1-9 in every row, column and blocks of a single colour (so 1-9 in the yellow boxes, 1-9 in the blue boxes, etc). Here's an example:

          4 3   5
        4   9    
    2 5          
      6       9 7
            6    
2               4
5 9 3 1   2      
                 
  6   7       1  

Puzzles will be posted automativelly every day!