Rules:
-Ordinary sudoku rules apply.
-Killer Sudoku Rules apply. Digits cannot repeat in cages and must sum to the number in the top left (if given).
-Looking glass rules apply. Each digit (1-9) has a “buddy” that appears in all of the cells where the row and column indices are swapped.

Rules:
-Ordinary sudoku rules apply.
-Lucky Charms Rules apply. Some cells are lucky charms. Each lucky charm symbol represents a different number. The digits near the lucky charm (adjacent and diagonally adjacent) that are within 1 of the lucky charm’s number are called close neighbors.

Rules:
-Ordinary sudoku rules apply.
-Little Killer rules apply. The sum of the digits along the indicated diagonal is indicated. Digits may repeat along the diagonal.
-Looking glass rules apply. Each digit (1-9) has a “buddy” that appears in all of the cells where the row and column indices are swapped.