Place 0-9 in each row, column and region. The four shaded 3x3 corner areas are magic squares. The four cages' totals must be determined and their product must be 500,000 (i.e. cageA*cageB*cageC*cageD=500,000). A 'V' between cells indicates that their values sum to five and an 'X' that their values sum to ten - not all Vs or Xs are shown.