do you happen to know how many blocks are needed for each star level? not listed on event wiki
If you pop groups of 5 or more blocks you create a Chest, which you can collect to get rewards, including a chance for the Daily Special. The Daily Special chance increases based on the size of the group of blocks, for a full list of rewards check out the fandom wiki. In total there are 6 "tiers" of Chests:
5 Blocks = 1 Star Chest (2% Daily Special Chance)
6 Blocks = 2 Stars Chest (3% Daily Special Chance)
7 Blocks = 3 Stars Chest (4% Daily Special Chance)
8 Blocks = 4 Stars Chest (5% Daily Special Chance)
10 Blocks = 5 Stars Chest (6% Daily Special Chance)
15 Blocks = 6 Stars Chest (16% Daily Special Chance)