Logic Masters Deutschland e.V.

The number 7 is often considered to be lucky, and this grid has loads of them!

Lucky Killer Sudoku Rules

This puzzle is similar to a standard killer sudoku, but instead of 8s and 9s there are extra 7s. In each row, column, and outlined 3x3 subgrid you must place the digits 1 through 6, plus three 7s.

Furthermore, the 7s specifically must be placed according to anti-knight rules: none of the 7s may be placed a knight's move apart from each other.

Killer cages are outlined with dashed borders. Each cage has a number in the top-left which indicates the sum of its contained digits. Within a cage, each of the digits 1 through 6 may not occur more than once, but ANY number of 7s are allowed.

Links and Puzzle

• Play on SudokuPad