Trio Sudoku is one of the easiest Sudoku types. In Even-Odd Sudoku, the puzzle is divided into two parts with each part can be solved individually. This division makes Even-Odd Sudoku very easy Sudoku variation. However, in Trio Sudoku it is divided into 3 parts with each part solvable independently. So if one wants to teach Sudoku variations to kids then Even-Odd Sudoku and Trio Sudoku should be the first few types which one should be teaching to kids.
This Trio Sudoku, I am posting as 71st Sudoku in Fun With Sudoku Series.
Rules of Trio Sudoku
Classic Sudoku Rules apply. Additionally, cells with circles must contain the digits 1, 2 and 3. Cells with squares must contain the 4, 5 and 6. Blank cells must contain the digits 7, 8 and 9.
 Trio Sudoku (Fun With Sudoku #71)
Trio Sudoku(Fun With Sudoku #71) Solution

Previous Fun With Sudoku Series Puzzle: Classic Sudoku (Fun With Sudoku #70)
Next Fun With Sudoku Series Puzzle: Non-Consecutive Sudoku (Fun With Sudoku #72)

The solution of Mini Puzzles Series puzzle: ABC Second End View (Mini Puzzles Series #3)
 ABC Second End View (Mini Puzzles Series #3) Solution