What is the logic behind breaking eggs at level 4050 and up. I break 2-4 of them at once and score..

These have buttons at their mid waist. 3 buttons means there are 3 layers (think doll with in a doll within a doll). You must connect the doll with in the sequence 3 times to burst it to the explosion stage. If you see 2 buttons then connect that one twice for full explosion. If the egg looking doll has one button at his mid waist then right after you connect him in a link sequence he will explode and you will get credit for popping one doll. These little moving dolls are like the Russian stacking dolls!