Mindscape today introduced the next puzzle craze to hit a PC desktop near you, Mindscape Kakuro. If you do Sudoku. Sometimes called "Cross-sums" or "Kakro", Kakuro is often referred to as Sudoku's bigger (and tougher) brother. The game operates along the same nine number principles as its forebear, only now a new dimension of complexity awaits puzzle fans looking for a fresh challenge.