Proceed to Bellevue - the road to the garden is blocked by a rake. Turn right and click on the tree. Hmm... an angered gardener will kick you to the market. Return to Bellevue, it turns out that the rake had disappeared. Enter the garden and pick up the shovel. Try to take an egg. A minigame will begin, in which the egg is stolen by a mischievous rodent, moving from one hole to other. The rodent moves similar to a chess knight - one field forward and one to a side. Your job is to block the holes with stones or a trap in such a way to block the rodent so that he cannot move. After a moment the rodent will be caught in the trap, while you'll be able to pick up the earth platypus' egg.
According to the guide, you'll now need frozen earth. Travel to the docks and pick up the bucket hanging on the pole found on the fisherman's right side. Visit the Bellevue garden to get some earth from the pot. Place the egg inside the bucket and make your way to Doc. While in his office, approach the freezer. Place the bucket inside - a platypus will emerge. Unfortunately, he is already aggressive towards you. Click on the switch next to the freezer - the ice will turn into water, in which the platypus will start to swim. Click on the switch again and use the shovel to pick up earth platypus. Return to Bellevue and place the animal in the nest.