Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules - Enter a digit from 1-9 in each cell without repeating in a row, column, or box.

Killer cages - In a cage, digits cannot repeat and sum to a total which must be deduced.

Cage factor circles - A circled digit in a cage indicates the number of prime factors in the cage's total. Repeated factors are counted multiple times and 1 is never counted. For example, a circled digit in a cage summing to 45 must be a 3 because 45 = 3×3×5.

The inequality symbol points to the lesser of the digits it adjoins.

Play the puzzle on Sudokupad

I hope you enjoy the puzzle! It's a tough one :-) Feel free to refer to this factor chart for reference, if you don't want to work them out in your head.