XV Trio Sudoku (Fun With Sudoku #127)

I am trying to mix XV Sudoku with different Sudoku type and able to create few good puzzle types like Non Consecutive XV Sudoku (Daily Sudoku League #134), Anti Knight XV Sudoku (Daily Sudoku League #106), Jigsaw XV Sudoku (Daily Sudoku League #80) etc. Here is another new Sudoku type XV Trio Sudoku after mixing XV Sudoku with Trio Sudoku. It is quite interesting Sudoku type and is requiring a few hints to be given. Even though only 1 hint is given in this Sudoku but this Sudoku is quite easy.

It has taken quite a lot of effort to create the Sudoku image for XV Trio Sudoku. First I tried to create an ESP Image.. I was not quite successful in creating the mixed image of XV Sudoku and Trio Sudoku. Later I created separate images of XV Sudoku and Trio Sudoku puzzles and merged these images together to create XV Trio Sudoku. I will be creating few more puzzles of this type soon.

This XV Trio Sudoku, I am posting as 127th Sudoku in Fun With Sudoku Series.

Rules of XV Trio Sudoku

Classic XV 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.