I'm sure someone has already put the solution but I can't find it so I wanted to post this to help anyone who hasn't figured it out yet.
Several people were close but they forgot a step.
Bring down the menu and hit devices, push the 3 dot menu and select manage apps. There if you have enabled the easter egg, you know tap on version then turn dial, you can turn on the controls for the cat game. After turning them on you can select it with the same drop down menu as selecting smartthings or Google home. After changing to the cat control menu you can fill dish add water or play. If anyone is interested I can try to post some screen shots. Also if already posted feel free to remove
Hope this helps someone
Bye I did this on a s20 5g android 11 One Ui 3.1