Use the left arrow key to change the food costume. Once you have the right food, touch it with your mouse to drag it to the cat and see if you were right.
This was made for a workshop exploring Face Sensing blocks versus other inputs (like mouse, sound, and keyboard keys). Compare with my face sensing version here: https://scratch.mit.edu/projects/1216390004. Instead of using left arrow to change the food sprite costume, try using a left head tilt. And instead of moving the food to the cat with the mouse, try moving it with your nose! See inside for more information. Thanks to STEAM for Vietnam for the sprites!