Super Mario Bros. Tips

1 up world 1-2
In the second levil of world 1 there will be a hole, on the other side of the hole hill be some floating conected bricks. go to the end and jump and hit the cealing. if you are big than instantly jump up and hit the brick next to it than jump down to collect it.
If you are small DO NOT HIT THE BRICK NEXT TO IT the mushroom will change and make it impossible instead fallow it intell it falls threw a crack in the cealing.

p.s. i am not sure it will work on a game boy. i have only tried it on a NES.,