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Level 1
Hello @HabibAdnan When you say that your Fast Race isn't working do you mean that it is disappeared from your Events?
If it is missing from your events then try the standard troubleshooting techniques
Check that your app is up to date. Log out of your game and restart your device. Log back into your game. Depending on which platform you play on clear the app cache/clear browser history.
If none of this works then please note that all features of Candy Crush should not be considered permanent. Having a feature is no guarantee that you will keep it, or get it back if you lose it.