In this game you can undo the steps you taken so that you get better future view of any step taken
It will start the node on the port 3000 and you can access app using url http://localhost:3000
if this not work then
run following command
$npm install -g create-react-app
$create-react-app my-app
and empty the src folder and replace the src of ths repository
and run
$npm start