How do you unlock debug mode on Sonic Mania?

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Tags

1. #appears
2. #nintendo
3. #sonic
4. #switch
5. #select
6. #loads
7. #title
8. #simple
9. #screen
10. #debug
11. #press
12. #prompt
13. #enter
14. #point
15. #level
16. #activating
17. #button
18. #mania
19. #until
20. #activate