A standard Killer Sudoku, except that the usual 3x3 blocks have been replaced by irregularly shaped, coloured blocks. Variants of Killer Sudoku are quite challenging to compile; these puzzles are from Philipp Hübner.
Place a digit from 1-9 in each empty cell so that each row, each column and each irregularly shaped coloured block contains all the digits from 1-9. The digits in each inner shape (marked by dots) must add up to the number in the top corner of that box. No digit can be repeated within an inner shape.
Related PuzzlesKiller Sudoku Extra-Region Killer Diagonal Killer Colour Killer Sudoku Killer Uncaged Extra-Region Sudoku