Collection index and biome progress

Quick answer

The value of the egg and the income generated by the pet depend on two main factors: its size and its rarity.

Documented size and value effects

One very important thing to know is that all eggs come in different colors; these colors affect the appearance of the egg and the pet, but not the income they generate, so rely on the egg's shape instead.

The larger the egg, the higher the value multiplier applied to the animal inside it. But above all, it will be heavier, and you will be slower.

NOTE: Pet income also depends on their size and mutation .

How collection affects progression

Eggs are grouped by Biomes , in the order you'll unlock them as your Speed increases.

Collecting and hatching them allows you to increase your income per second ($/s)—enabling you to move faster across the map—and unlock higher-level biomes.

How to track collection progress

The Pet Index is a checklist that shows which pets you have already discovered and which you still need to hatch.

Completing the Index gives you speed and money boosts.