Love Tester 2.0
From the Super Mario Wiki
A skunk (Player 1) and a bunny (Player 2) will be seen on screen when starting the Love Tester. Both players will then be asked to choose a color and draw half a heart. Based on how the hearts are drawn and connected to each other, the Love Tester 2.0 will explain what each player could be feeling and how high the love percentage is.