level 670?

Hello @nanamom and welcome to the community. Level 670 is a typical legendary level which King have created to hold players up and make them spend all their boosters they may have saved up and gold bars for the extra moves. If you are stuck on this for a long time and have any gold left I would advise you to use it to pass once the game offers you enough extra moves for your 10 gold.

This level cannot be passed on each attempt but relies on a lucky board.

There is only one possible first move so where the UFO goes and which candies then drop determines if you will get a chance to pass this level or not, and you will not be able to pass on each attempt, but only if you get the lucky board to do so. Watch out for the chance to make matches to create special candies and combos of special candies that will hit the many toffee swirls. A wrap/stripe combo can be very powerful. A colour bomb/wrap combo wins the level in this video below, but don't be fooled into playing these as a starting boosters, since for me using starting boosters did not help me pass this level, and you will be wasting a lot of boosters if you do.

This video might help: