The cat can appear in any game at any time. It can manifest as various objects, some of which can be random things in game or in scratch. How does The cat appear? Unknown How was the cat created? It was made through bad code strung together in order to form a semi sentient being. Is it hostile? It can be. If you believe it’s in a game you’re playing or working on, don’t act immediately. Wait to see what it does and if it does act hostile either find an odd looking string of code and remove it or close out of the game. It can’t follow you to the home/landing page and after you believe it’s gone, go to the comments and tell the creator of its existence. If left unchecked for too long it will destroy the game and it will become unplayable.
This is just one iteration of the cat compiled together from its other sightings. The code linked to this one is a simple walk cycle. There is another thing it can be linked to which is a sprite or object in a character. Such as an apple in a character animation sheet. This sprite however will not appear in game. The example shown here is also harmless.