Good Egg Galaxy

The Good Egg Galaxy is the second galaxy Mario must venture to in Super Mario Galaxy. It is the first galaxy within the Terrace dome. It is a galaxy which, unlike many of the others in the game, does not have a set theme such as ice or fire. Rather, it mainly consists of multiple small planetoids and a variety of different themes that usually contradict each other. Because of this, it is arguably the most 'true' galaxy with a pure space theme. The galaxy starts on a planet with a garden and a house on top and a castle at the bottom. Dino Piranha and King Kaliente are fought in this galaxy.

Starting Planet
The Starter Planet has two sides. One is green with a house on it, and the other is dark and has a tower on it. On the tower side the player can get lots of Star Bits.

Pill Planet
The Pill Planet is shaped like a giant, transparent pill. It contains many obstacles and items, mainly Coins and Item Crystals. Atop the towering planet is a Launch Star that Mario can use to break out of the Pill Planet's glassy surface. This planet contains a 2D platforming area with variable gravity.

Magma Planet
This is where the boss battle against King Kaliente takes place. It consists of a hot lava pool with a shiny tar-like ring of ground around it. The rest of the planet is just simple hot rock. The planet is quite big compared to others like the Tropic Planet, since it needs to have a decently large size for the fight to be held. Underneath the Magma Planet is a rocky area with yellow rings on it like a target.

Egg Planet
One planet resembles a Yoshi Egg. This planet can be found in the mission known as A Snack of Cosmic Proportions, where a hungry Luma will await a feeding. There is also a green planet and a red planet which are part of a circle of launch stars with the Yoshi Egg Planet in A Snack of Cosmic Proportions

Geo Planet
The Geo Planet is a small planet where the Dino Piranha boss is battled. it is made of gravel and rock with hints of grass sticking out, much like a simple ball of earth mixed up together. There are Item Crystals on it with a few Coins in them.

Boulder Planet
It is a yellow planet that resembles a peanut with little grooves where the boulders have been rolling. It has about 6 boulders that Mario must dodge and or break. It had a different color appearance when it was first seen, but it ended up appearing with a recolor in the final version of the game. It was originally blue.

Enemies

 * Goombas
 * Electrogoombas
 * Swoopin' Poinks
 * Pokeys
 * Boulders
 * Piranha Plants
 * Moneybags
 * Chomps
 * Bullet Bills

Dino Piranha
Mario starts this level on a planet with a grassy scene and a house on one side and a dark tower on the other side. At the top of the tower is a Sling Star which propels Mario into a Launch Star. This sends him to the Boulder Planet, where five Star Chips are scattered. The player will have to dodge the boulders and collect the Star Chips to create a Launch Star. Mario lands on a small planet with a Piranha Plant. Mario must defeat the plant to make a sproutle grow. Mario must Star Spin up it. Next Mario must climb the stones on the next planet to the Launch Star. Mario will launch and slam into a giant egg, which will begin to move around. After Mario does a Star Spin on the ball on the end of it's tail, it will hit the egg and break it, revealing Dino Piranha. It must be defeated to get the star.

A Snack of Cosmic Proportions
This level involves feeding a Hungry Luma one hundred Star Bits, so the player should pick up as many as possible. When Mario is exploring this planet, he must hop up the stone stairs on the tower side of the planet and he should talk to the blue Luma. It'll transform into Pull Stars which lead to a Launch Star. This leads Mario to a set of three planets connected by Launch Stars. The planet that resembles a Yoshi Egg is the one that has the the hungry Luma. Mario can use the Launch Stars to travel around the three planets as much as he wants to fulfill the Luma's quota of Star Bits. The player must talk to the hungry Luma after getting 100 Star Bits, and it'll explode with snacky happiness and create a new planet and Launch Star. The player must climb up the structure on this new planet to reach the Launch Star at the top, which will launch Mario to the Pill Planet. One of the crystals on this planet covers the entrance, so the player must smash it to get inside. The player will enter a 2D platforming area, so Mario must head through it carefully. The top of the planet contains a Launch Star. Mario will finally end up on a star-shaped structure with blue Star Chips and the Power Star in the middle. The player has to collect the blue Star Chips to create Pull Stars, which will aid Mario in grabbing the Power Star. The player could also use a long jump to get the star without collecting the blue star chips.

King Kaliente's Battle Fleet
Mario starts on the same planet as he did on the previous two missions. The Launch Star is on the top of the house, and it is possible for the player to triple jump to the top of it, or else Mario can take the red Warp Pipe on the underside of the planet and traverse the boxy room to reach the Launch Star. The Toad on this planet tells Mario that the spiky plants hate coconuts. Mario will have to kick the coconuts into the plants, and one will reveal a Sling Star. The next planet has a large Pokey, which can also be defeated by kicking a coconut at it, revealing a Launch Star. The next planet has a Sling Star which propels Mario to a planet full of electrical walls. The player must carefully avoid the walls to reach the other side of the planet, where cannons shoot Bullet Bills. The Launch Star is in a crystal at the top of the structure on this planet. As Mario is launched onto a airship, two creatures will shoot coconuts at Mario from an adjacent airship. Mario will have to do a Star Spin to send the coconuts back at them to defeat them, which lowers the bridge between the two ships. The Launch Star on this airship that takes Mario to King Kaliente's planet.

Dino Piranha Speed Run(Speedy Comet)
This level is the same as the original Dino Piranha level, except that the player has to beat the mission in 4 minutes.

Purple Coin Omelet(Purple Comet)
In this level, the player has to collect 100 purple coins to get the Power Star. Mario must traverse through the galaxy and collect these coins using launch stars.

Luigi on the Roof
After Mario saves Luigi from the Ghostly Galaxy, Luigi will go to the Good Egg Galaxy to search for a Power Star. Shortly after, the Mailtoad informs Mario that Luigi is lost and shows Mario a picture of Luigi's location. Mario needs to go to the first misson of the Good Egg Galaxy and needs to save Luigi who is on the top of the roof of a house. Mario accomplishes this by going to the bottom side of the 2 sideded, bright and dark planet by jumping in the yellow Warp Pipe, and then into the next yellow Warp Pipe. Luigi gives Mario his Power Star. You can also do a backflip or Triple Jump onto it.

It is notable that the original e3 demo and gameplay footage mostly featured segments from the Good Egg Galaxy, along with a mixed-in level from the Spacejunk Galaxy.