Comes with instruction manual. What you need to do is:
1. Divide the sudoku in 9 equal parts.
2. Each part should be arranged in a way that it contains 1-9 numbers without repeating the number.
3. Arrange number 1-9 in rows and columns but without repeating in any number in the same column or row.
No maths is needed to complete the puzzles, and no guessing should be necessary either!