Normal irregular 7x7 Sudoku rules apply, i.e. each row, column and region must contain the digits from 1 to 7 once each. All cages are “Rellik Cages”. In a Rellik Cage digits do not repeat, and any combination of one or more digits within such a cage CANNOT sum to the value in the top left. (Eg a Rellik Cage with given value 6 cannot contain the three digits 1,2&3; the two digits 1&5; the two digits 2&4; or a single 6.