Tens Sudoku puzzle appeared in one of the World Sudoku Championship around more than 5 years back with the name Classic Sudoku with 10. However recent versions of this Sudoku type is named Tens Sudoku. So I am using modern name as this Sudoku type appeared with Tens Sudoku name multiple times. This current Sudoku was created for the preparation of World Sudoku Championship more than five years back when this Sudoku type appeared for the first time.
Rules of Tens Sudoku
Classic Sudoku Rules apply. Additionally, all adjacent cells containing numbers adding to ten are marked. Adjacent cells which are not marked must not contain numbers adding to ten.