I wanna say Rxg4? Because the bishop pins the pawn to h7.
Simple puzzle

You saw that better than the 1900 I just played did hehe. It's barely winning for white though because black gets the Rooks from white and it's a two rooks vs queen endgame

Rxg4 saw immediately
tbf I did title it "simple puzzle"
Don’t worry I’ve been staring at it for 5 minutes and still don’t see it
gimme your best guess even though I know you saw the solution from the previous comments already hehe

Wait is there a mate somewhere or is the point of the puzzle winning the queen
idk, what do you think?
White to move. What is the only move that saves the game for white?