Once a line of four eggs is formed a "hatch" is begun, giving the player a short time to create more lines of eggs to form a combo to score more points before the eggs hatch. When the "hatch" timer is up any eggs that formed part of a line will hatch and the little Piyos will fly off to collect on either side of the screen. An egg will hatch even if it is no longer part of a line of matching eggs, so long as it is not being held outside of the nest. The remaining eggs will fall to fill in the gaps. When enough points are scored the player's level increases.