The liquorice swirls will stop any special candy combinations (Except for wrapped candy + wrapped candy combinations).
After using the bombs to make some form of special candy, try your best to break into the centre of the liquorice blockers head on. Any kind of special candy can be useful, but wrapped candies are going to be particularly strong due to the number of liquorice swirls.
People may fail this level by clearing all the blockers and forgetting to take the order. 222 candies is a lot, so collect the orders throughout the level. Although four colours will help you, do not leave the order for the last few moves. Use your moves wisely. However, this level - in general - is pretty easy. Do not worry too much about the difficulty.