Logic Masters Deutschland e.V.

This is an even/odd Killer Sudoku with one given digit and one simple special rule for cages.

Normal Sudoku rules apply.

In cages digits may not repeat and sum to the total in the top left of the cage

Digits in grey circles must be odd, and digits in grey squares must be even

Special rule. Each cage has a digit 3 in one of its corners. The completed grid has 3 in two of its four corners.

Here is the Sudokupad link: Three in the spotlight

Here is an F-Puzzles link: Three in the spotlight

NOTE: I could not have set this puzzle or imagined that anyone would be able to solve it, without the Cracking the Cryptic channel. The underlying logic will be well known to experienced solvers but appears in a unusual way which may be unfamiliar. There is a part of the solve that some solvers have found very tough.