The first new 2D Mario platformer since Super Mario World has arrived! Incredible 3D graphics to accompany classic 2D gameplay, this fast-paced adventure will have Mario and his friends adrenaline filled as they make their way over fields, under water, through castles and into the air.
Official trailer
Once you complete the game, go to the world map and enter Start, L R L R X X Y Y.
Beat the game and save it. Then, select the saved game and hold down both the L and R BUTTONS, then enter A. The green sporting super mario bro is unlocked.
I can confirm that you do not need to clear the game to play as Luigi. Just hold L + R and press A on the file you want to play, and you will be Luigi, regardless if you finish the game or not.
If you complete any stage when the last two digits of your countdown timer are the same (ex. 177, 233, 088) a bonus mushroom house will appear on the far left side of the world map. Stopping the timer with 11, 22, or 33 will give you a red mushroom house with a random item box. A timer with 44, 55, or 66 will give you a green mushroom house that rewards you with 1-Ups. Stop the timer at 77, 88, or 99 and you'll unlock an orange mushroom house that gives you a Mega Mushroom.
To get a particular item from the red mushroom houses then hop into one. When Toadsworth starts the slot go under it. Here's the tricky part: pause the game two items before the one you want and double tap A or B. For example, if you want a mini mushroom, pause the game at the flower and press A or B twice. Viola! You get the mini mushroom.
If you're having trouble defeating a boss, bring a Mega Mushroom into the stage. When you fight the boss, activate the Mega Mushroom and simply stomp all over the enemy to defeat him. This is especially useful at the end of the game where you have to fight two enemies at once.
Instead of immediately jumping onto the flag pole at the end of a stage, take your time and watch the clock. If you hit the flag when the last two digits of your timer are the same (example: 133, 211, or 099) you'll unlock a mushroom house on your World Map. If the last two digits are 1, 2, or 3, you'll unlock a red mushroom house. If the last two digitsl are 4, 5, or 6, you'll unlock a green mushroom house. If the last two digits are 7, 8, or 9, you'll unlock an orange mushroom house.
At the end of the levels, jump onto the flagpole and when the last two digits of your countdown timer are the same. For Red Houses, jump on at 11, 22, or 33. For Green Houses, jump on at 44, 55, or 66. And for Orange Houses, jump on at 77, 88, or 99.
For getting more power-ups fast, go back to World 1 and play the stages with the red winged question mark blocks.