Hi. The building in the first city has all of those eggs or what ever there..

Get the guide book, you're doomed otherwise.

I forgot to mention this the other time, there are no codes, however, you can buy secrets with the precursor orbs. (The secrets are like cheats)

There is a way if you use my infinite flying techhnique which I submitted in the hints section then you can see the whole town. There are no codes only the secrets.

Go around to the mini game adventure console thing and jump on top of it and then there should be a ledge jump on that and then jump on the pipes sticking out of the ledge above you. Keep doing this until you reach the top. You will need to walk around the other side to get to another set of pipes.
And no,there are no codes.

Somewhere in Spargus city there's 2 houses with an alley between them. You know that it's the alley because it has a bunch of vegetable baskets inside it. In the alley, there's a ladder to the top of one of the houses. On top of the house, there's a rail. Grind it. You will have to jump from rail to rail, collecting eggs until the rail ends at the top of the wind mill. Quickly get off of your jetboard, and fall high roof of the house. Get the eggs, and continue to the lower part of the house. Get those egges, and presto! You can also stand on the bridge (right beside the house with the eggs) and fly up. Make sure to time your wing flapps just right.