When you get to multiplayer, type in anything in the username box.
Then go to the password box. DO NOT HIT ENTER TO DO THIS. You MUST click on the box.
Type in whatever the heck you want, then CLICK (DO NOT HIT ENTER) the “remember my username and password” button.
Then, hit enter when it tells you you can’t log in, then backspace. DO NOT CLICK to exit. You must hit backspace!
Then hit enter when it asks you if you want to go to single player.
Follow this exactly and it should work, single player will open and you can play.
Comment if I said something incorrect.