Logic Masters Deutschland e.V.

Standard sudoku rules applies. Fill the grid with numbers from 1 to 9 so each digit occurs exactly once in every row, column and 3x3 box.

Four digits surrounded the circle mean there are 2 odd numbers and 2 even numbers.The number in the circle show the product of the biggest and smallest number around the circle.

All possible circle are given. In other words, places without a circle don't have the same amount of odd numbers and even numbers.

This puzzle is made by Old Miles from China in 2017.If you finish the type good S, you will find this one so much easier.

It's a variation from type good.And it's actually the last of type good variation from Old Miles but, spoilers, not the last of type variation. It's still interesting even from now how a type bad C can give inspiration to so many variation and the difficulty can still remain the same(still all 2 star )