Mario Squared Galaxy

Mario Squared Galaxy is a galaxy appearing in the game Super Mario Galaxy 2. It is located in World S. The galaxy takes place on an 8-bit Mario, which is an obvious reference to the levels in Toy Time Galaxy from the first game. However, the spinning platforms have been replaced with Flipswitch Panels. An 8-bit Luigi appears on the opposite and serves as a Purple Coin level. It keeps its trademark poisonous goop, but this time, the yellow platforms don't spin and there are only 100 Purple Coins in the mission.

Planets
NOTE: Unless otherwise noted, all names are unofficial.

Starting Planet (Mario)
This planet serves as the starting planet for most of the missions. The planet is shaped almost exactly like a sprite of Mario from Super Mario Bros. The green pixels are Shrinking Tiles, the red pixels are lava, and the yellow pixels are Flipswitch Panels. The Comet Medal is found at the bottom left of the planet. The only enemies here are Li'l Cinders and a mobile Sentry Beam.

Starting Planet (Luigi)
This planet only appears in the "Luigi's Purple Coin Chaos" mission and is on the back of the 8-Bit Mario Planet. The planet is shaped almost exactly like a sprite of Luigi from Super Mario Bros. The green pixels are Shrinking Tiles and poisonous water while the yellow pixels are solid yellow platforms. One hundred Purple Coins are found on this planet. The only enemies here are Cosmic Clones. This part of the galaxy is almost an exact replica of the Luigi's Purple Coins mission in Toy Time Galaxy, except that the yellow platforms from Super Mario Galaxy slowly flipped over and kept flipping when stepped on. The Cosmic Spirit will appear in this level if the player is struggling to complete it.

Enemies

 * Li'l Cinders (8-Bit Mario Planet only)
 * Mobile Sentry Beam (8-bit Mario Planet only)
 * Cosmic Clones (8-Bit Luigi Planet only)

Make Mario a Star
To complete this mission, the player has to activate all of the Flipswitch Panels found on the 8-Bit Mario Planet Half to make a complete 8-Bit Mario. The player must avoid Li'l Cinders and the lava while doing so. After all the Flipswitch Panels are yellow, a Power Star appears on the platform where the player first landed. The Comet Medal can be found on the far left on this Planet.


 * Enemies
 * Li'l Cinders
 * Mobile Sentry Beam
 * Planets Visited
 * 8-Bit Mario Planet


 * Names in other languages

Luigi's Purple Coin Chaos
When the Prankster Comet is unlocked, the player ends up on the 8-Bit Luigi Planet Half. This mission resembles the Luigi's Purple Coins mission in Toy Time Galaxy of the original Super Mario Galaxy, with some key differences, such as the change in time limit and the number of Purple Coins being decreased to 100. To complete this mission, the player needs to get all 100 of the Purple Coins found on this planet within a two minute time limit. There are also Cosmic Clones that continuously follow the player and need to be avoided. If the player manages to obtain all of the coins before time runs out, the Power Star will appear on the platform where the player started.


 * Enemies
 * Cosmic Clones
 * Planets Visited
 * 8-Bit Luigi Planet


 * Names in other languages

Green Star 1
The first Green Star is located under a disappearing platform in the top right, near the back of the "Mario Hat" lava pool and right above the "eye". Just wait on the center of the platform, and drop down to land onto the star. Watch out, for if the player is not in the center of the platform, then Mario will fall past the star and lose a life. If the player misses, he/she can spin before really falling into the Abyss.


 * Enemies
 * Li'l Cinders
 * Mobile Sentry Beam
 * Planets Visited
 * 8-Bit Mario Planet Half

Green Star 2
The second Green Star is located on another disappearing platform, yet to the far top left on the "right hand" of the planet. Mario must simply stand in the middle while the platform is shrinking, and fall down onto the star. If not done correctly, Mario will fall to his death instead of on the star. Like before, the player can spin before falling to their death if they missed.


 * Enemies
 * Li'l Cinders
 * Mobile Sentry Beam
 * Planets Visited
 * 8-Bit Mario Planet Half

Trivia

 * In the Japanese and Italian versions, when Luigi is selected as a playable character, the name of the galaxy changes from Mario On Mario Galaxy to Luigi On Mario Galaxy.
 * In the Prima Games Guide, it is stated that Green Star 1 is located at the left leg of the 8-Bit Mario Planet. However, this was changed to the location of Green Star 2 in the final version of the game.