Trio Sudoku (Fun With Sudoku #78)

When it comes to easiest Sudoku types, Trio Sudoku tops the list. I don't think that any other Sudoku type can be as easy as Trio Sudoku. In this Sudoku type, solving is divided into three separate parts where each part can be solved independent of each other and hence making the Sudoku easier by 1/3. Another interesting easy Sudoku type is Even Odd Sudoku, in which Sudoku is divided into two parts with every part solvable independently. This is my second Trio Sudoku, with first Trio Sudoku published with title Trio Sudoku (Fun With Sudoku #71).

I am posting this Trio Sudoku as 78th 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.