What is Sonic Mania encore mode?

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Tags

1. #encore
2. #level
3. #extra
4. #mania
5. #original
6. #rearrangement
7. #mighty
8. #light
9. #sonic
10. #version
11. #characters
12. #squirrel
13. #flying
14. #expanded
15. #expansion
16. #armadillo