How do you add a second player to Cuphead?

Related questions

1. How many levels are in Cuphead?
2. Is Cuphead really hard?
3. Where are hidden coins in Cuphead?
4. Which game is harder bloodborne or Dark Souls?
5. Is Cuphead all hand drawn?
6. Will there be a Cuphead 2?
7. How long does it take to beat Okami?
8. Is Cuphead harder than bloodborne?
9. Is Doom eternal a DLC?
10. Is Dark Souls harder than Cuphead?

Tags

1. #appear
2. #press
3. #though
4. #cuphead
5. #disconnect
6. #started
7. #second
8. #register
9. #simply
10. #controllers
11. #mugman
12. #controller
13. #keyboard
14. #button
15. #sometimes
16. #connect