For a custom version of the game, to change the server repo the game gets these assets from, find this script in the stage sprite and change the set server repo block to the URL of your fork.
Each of these sprites have a custom block to help you do this!
To check out the state of the game, press the 1 key to show the state and substate variables.
Every time the state of the game switches, it uses a state variable along with a state sync broadcast. To add a new script for when a state starts, do something like this: