Hints and Tips for New Super Mario Bros 2
(3DS)

Go to world 1 mini-castle. A little bit after the checkpoint, go into a door with a cross on it. Instead of going into the other door with a cross on it, in the other room, go into the hole in the middle of the wall on the right. There should be a flag somewhere near. Once you land on the flag and have completed it, a path to a cannon should appear. Do the cannon and you should be in world mushroom.

If you go to the 11 square block and jump up you go to a secret area(make sure you climb the vine) and you will find a block hit the block and out comes the 1 up

Get all star coins and spend them you should have 9 left go to star world theres a new toad house which is gold you might think it's a gold flower but it's a star so you can turn into star man

Go to a star house and get a gold flower in your item pocket. Then go to W2-4 and use the random block. If you got a gold flower, good. If you didn't that is o.k. Too.
Go to the second hill of pass-through platforms and find a gold pipe next to a Pokey. Go and use the gold flower if you didnt get one earlier. Jump on the first goomba and hit the gold ring. Then jump on 4 goombas without touching the floor, then for every goomba you jump on untl you fall, or the gold ring wears off, you get a 1-up. My best record is 7 1-ups.