Use the arrow or the WASD keys to move. You are the blue cat. You will notice that there is only a blue cat well there is actually a pink cat following behind you. Well you don't see a pink cat. Right? You don't see one because the pink cat is behind the blue cat so if you click See inside and then in the pink cat you can press the go to front layer block so then you will see that there is also a pink cat.
Thank you @Scratch_TutorialsYT for the tutorial.
