Agree... very frustrating that they removed the opportunity to go back and replay previous levels to collect the different boosters. Without the special boosters I only manage one level each day and that’s boring.
It isn’t impossible. You just have to be patient and try to hit the middle liqorice as many times as possible. After a while the liqorice will drop and turn into regular candy, and you will be able to clear the level. Don’t waste any hammers unless the liqorice is gone :-)