Click the green flag and tell the cat how many times you want to shuffle the deck. Just don't say no to the cat... I heard it doesn't like it. For larger numbers (such as 10,000 +), turbo mode may help increase the speed of the shuffle. From my experience 10,000 shuffles would take around 5 seconds, 100,000 shuffles 50 seconds, and 1,000,000 around 6 and a half minutes to 8 minutes.
I created this in the middle of the summer because I was bored. I mean it only took 1400+ blocks of code :D ! Sup Hello Shhhh if you need the emojis for some of the modes here they are: ♣ ♠ ♦ ♥