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I gave you my best advice here:
All levels are essentially the same so advice for one levels essentially fits all:
Play one episode per day.
Use events to get boosters and use those boosters wisely.
Use starting boosters only on your first attempt at each super hard/nightmarishly hard/legendary level.
If you fail repeatedly use a maximum of either one strong booster or 10 gold bars to pass.
Otherwise you will need to wait for a lucky board, which may take more lives than you have. To get more lives make sure you invite lots of friends to your game. Send and request lots of lives to all your friends.
Make sure you win every episode race, so do not start a new episode until you have enough boosters or gold bars to confidently play the entire episode in one day.
I really don't have anything to add to this. All levels are essentially the same:
Play the first move the game suggests. Play subsequent moves to make special candies. Try to make combos of special candies. Try to remove as many blockers as you can. If you are on a "fail" board you will fail, if you are on a " lucky" board then you will pass if you play your last 7 or 8 moves wisely to take advantage of the chances the game gives you.