Normal sudoku rules apply. Several (invisible) killer cages are present in the grid. Digits in a cage cannot repeat, and sum to the clue in the top-left-most cell of the cage (top-most is evaluated first, followed by left-most). Cages cannot overlap. Only the number for each cage is visible, and it is up to the solver to determine the rest of the cells each cage visits. Every cage visits at least two 3x3 boxes and has an equal number of cells in each 3x3 box visited.