When you have beaten Bowser with Mario go to the gate and step onto the little castle. Agree to help Rosilina protector of the cosmos and she will leave you with a red powerup luma to help you. Collect ALL 100 purple coins and you will get a red star which will give Mario red and black clothing and the ability to fly.

When you have collected the final star with Mario and Luigi so you have the required 120 to unlock the 'Grand Finale Galaxy' and saved the game you can then view your death count on your 'Save' file to see how many times you were killed during the game with Mario and Luigi.

When you are racing against Shadow Mario hold forward when the countdown timer starts and when it hits 2 hold down on Z to crouch. Then press A as soon as the race starts and for several seconds you will turn yellow and recieve a boost that will leave Shadow Mario way behind.

To perform this special move which attacks the nearest enemy or breakable object in the game you have to press Z when you spin in midair.

Collect ALL 120 stars with Luigi and beat Bowser, when you've done this the Grand Finale Galaxy becomes unlocked which is the Star Festival you saw at the start of the game. When you have collected the 100 purple coins in this galaxy you get Star 121 which is the final star.

To unlock this hidden character you must collect ALL 120 stars and then return to Rosalina on the Comet Observatory and ask to fight Bowser again. When the credits have completed you will see a message that tells you that Luigi is now available as a playable character.

At the 'Main' menu press A + B + 1 + 2 to unlock two hidden extra stages in the Demo version of this latest installment in the hugely popular series by Nintendo.