Super Mario Galaxy 2 Cheats

Maximum lives

Firstly fly to supermassive galaxy (not on the comet level)and progress your way through until you reach the planet with the 3 huge koopas (I would reccomend a friend helping you on this because its quite hard doing it without a friend helping you,stun ONE Koopa) long jump onto its back and follow its path whilst on its back for a while you will start to see 1 ups appearing.
99 1-ups - Long jump on koopas shell

Green Star Challenge

Collect all 120 stars and beat bowser and you will get a new cutscene with Rosalina reading about the green star to her "children".

Unlock Green Prankster Comets

Grandmaster Galaxy

Collect all 240 stars(Includes Normal Stars, Prankster Comet Stars, and Green Stars).

Death Count

Once you get final Star from the Grandmaster Galaxy (The Perfect Run) you will be able to see your death count on your save file.

Banker Toad's Items

The toad that banks your star bits will unlocks some items as you deposit more star bits. These are not for Mario, he will simply use them himself.

Yoshi Infinite Flutters

Jump holding A and before you finish Fluttering (While still holding A) Press Z, then quickly release A, then Press A again. Rinse and repeat.

Play as Luigi

Defeat Bowser at Bowser's Galaxy Generator for the first time, then check the Mail Toad for a message from him. Look for the L on the Spaceship, enter it, and then you become Luigi.
 

Secret World