Edited: Sudoku Image Modified (Marked Diagonals are Shown)
This is my 9th Sudoku contribution to:
Daily League! The League of Extraordinary Ladies and Gentlemen
Remember that you can solve this puzzle from the League online on the Sudokucup Guest League page with a 24 hr delay.
Fill in the grid with numbers 1-9 so that each row, column and outlined 3x3 box contains each number exactly once. Exactly three distinct numbers appear on each of the marked diagonals.
Theme: P^2 (Literally two P's and two Squares) :)