How do you debug mode in Sonic the Hedgehog?

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Tags

1. #cheat
2. #originally
3. #press
4. #debug
5. #hedgehog
6. #first
7. #screen
8. #special
9. #after
10. #there
11. #sonic
12. #select
13. #button
14. #unlocking
15. #player
16. #level
17. #selecting
18. #style
19. #other
20. #access