Trio Sudoku (836)

Instruction:

Apply classic sudoku rules. Cells with circles must contain the digits 1, 2 and 3. Cells with squares must contain the digits 4, 5 and 6. Blank cells must contain the digits 7, 8 and 9.

Reference: WPF (1)

Examples:

WPF Sudoku GP 2019 - Round 4 (127)

Parent puzzle:
Odd/Even Sudoku