SUDOKU S T E M Learning Aid

This is a path-finding S.T.E.M learning aid (wherein scientific, technical, engineering and maths skills are imparted) in solving the classical Sudoku puzzles. These puzzles incorporate the entire 81 grid matrix.
This game puzzle comes with a puzzle-game book, assorted colour numbered tokens (1-9) and a 81 grid play mat with in-built cavities so that the tokens once placed, do not get dislodged on the mat.
The Sudoku examples in the book reveal a certain number of spaces already filled and one has to complete the rest using logical thought process. The puzzles range in complexity from relatively easy to fiendishly difficult depending on the number of spaces filled initially and also the filled positions.