Sudoku is very simple to learn, requires no calculations, and provides a surprisingly wide variety of logic situations. All that is required to solve Sudoku is brains and concentration. No wonder Sudoku is among the most popular puzzles in Japan.
This puzzle was first introduced in Puzzle magazine Nikoli Vol.11 and since then it has gained enormous popularity from wide group of people and now is the king of pencil puzzles. The more you solve, the better you become at Kakuro and your hand moves so fast chasing the answer numbers flashing in your head even without thinking. It is inexpressible enjoyment.
Don't worry about addition and subtraction, because Nikoli's Kakuro keeps those parts as less as possible.
When you feel like starting Kakuro, just use the fixed patterns. You'll see them work and your first Kakuro is finished.
1 unit comes with 30 puzzles with 60 pieces of paper.