What is a score booster in subway surfer?

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Tags

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2. #multiplier
3. #through
4. #weekly
5. #power
6. #player
7. #hunts
8. #costs
9. #booster
10. #score
11. #increases
12. #until
13. #added
14. #subway
15. #possible
16. #mystery
17. #world
18. #surfers
19. #available