Mushroom through the blocks
                       Keep a shell sitting on an "unused" question block, and if you can get a Mushroom to slide onto that same block, hit
                       the block and the Mushroom will drop down. Try this in World 2-1.
                       --[Sent in by Juan Pablo Peloso]

 
                                 Walk through walls
                       In 1-4, pass the first firebar thing and stop on the next platform. You'll notice that the ceiling drops down and almost
                       forms a wall. Slowly go to the right until there's about half a block length between the left edge of the screen and that
                       wall. Direct Mario to the left side of the screen, and jump. Mario should hit his head on the ceiling and land on the wall.
                       (If Mario can't fit, you've scrolled too far. If Mario doesn't get stuck, you haven't scrolled far enough.) Now, hold Left and
                       jump rapidly until Mario starts moving backwards through the wall. At this point, you'll be able to walk through to the end
                       of that low ceiling (beware the firebars...). It is possible to repeat this trick anywhere you find similar floor/ceiling/wall
                       combinations.

 
 

                       Un-Fiery Mario
                       (This is sort of related to the "drown bug" listed down at the end.) Bring Fiery Mario to a water level. Stand on the sea
                       floor and hold Down as you press A to swim up again. You won't be able to shoot fireballs until you touch the floor
                       again!

 
 

                       Minus World
                       World -1 (A.K.A. the "Minus World") is an infinite water level, only accessible through World 1-2. Here's what you do:
                       As Super Mario, get all the way to the green pipe at the end of 1-2. Stand on top of the pipe and smash the blocks
                       above you. Do not smash the very last block on the right. Now, stand on the end of the pipe and face left. Jump straight
                       up, then press and hold Right on the controller. What you are trying to do here is jump through the bottom left corner of
                       the block backwards. If you do it just right, Mario will slide through the block and be pulled through the wall. When
                       Mario gets to the other side of the wall, go down the first pipe before it says "WELCOME TO WARP ZONE." You will
                       not come out in 4-1, but in -1. Yes, that's right, -1. World -1 is just like 2-2, but the pipe at the end takes you back to
                       the beginning. You cannot beat -1, but it does give you lots of swimming practice :)
                       Side note: If you go dowm them before it says "WELCOME TO WARP ZONE," the second pipe takes you to 5-1, and
                       the third pipe also takes you to the Minus World.

 
 

                       Small and Fiery
                       Being either Super or Fiery Mario, get behind Bowser and let him walk towards you. Jump, and try to land on the Axe
                       and Bowser at the same time. You will defeat Bowser and move on as Super Mario. In the next World, the next
                       powerup you'll get is a Mushroom, which will make Mario small. Next item you'll get is a Fire Flower, which will turn you
                       Fiery, but you will remain small. Note: This will not work in 8-4.

 
 

                       Thank you dead Mario!
                       Being small Mario, get behind Bowser and let him walk towards you. Jump, and try to land on the Axe and Bowser at
                       the same time. Bowser will hit the lava, as usual. Mario will "die" but he will angle towards the Mushroom Retainer and
                       off the bottom of the screen. The Mushroom Retainer thanks you, and you move on to the next level. Note: This works
                       in 8-4 also.

 
 

                       The Magic Koopa Troopa
                       You may already know that it's possible to stomp a Koopa Paratroopa twice in mid-air. If your second stomp is when
                       the Koopa Troopa is 1 or 2 block heighths from the bottom of the screen, he will go into his shell (duh), but it will be
                       floating in mid-air! Of course the only way to get the Koopa Troopa 1 or 2 block heighths from the bottom would be to
                       stomp on him over a pit. For a real challenge, try to double-stomp a Paratroopa and land on solid ground. The best
                       place I know of is in 4-3. This is extremely difficult, however. So anyway, after you land on the platform, the Koopa
                       Troopa should be in his shell and floating. Wait a while and he'll pop back out and start walking, while still floating in
                       mid-air! (I always do this bug in 4-3, but I assume it can be done in similar levels such as 1-3 or 5-3.)
                       -- [Found by Deezer]

 
 

                       Mario Copperfield
                       If you are Fiery Mario, you can pull off this cool stunt: Before any level begins (during the "WORLD #-#" screen), press
                       and hold A and B. When the level begins, use the arrow keys to move Mario... and he will be "gliding" along the ground
                       on one foot! Just release A and B and Mario will walk normally again. This also works when Mario is coming out of
                       pipes -- just hold A and B as he is emerging from a pipe....

 
 

                       Get stuck & drown
                       If you are Super or Fiery Mario, you can pull this off in any water level. Stop right before the pipe in the water that takes
                       you out to dry land somewhere. Press and hold Down to duck, then press A to swim, and then let go of Down. As long
                       as your feet don't touch down anywhere, you'll notice that Mario's head goes all the way through to almost the very top
                       of the blocks! Keep pounding Mario's head on the blocks as you swim above the exit pipe. Soon he will moonwalk
                       behind the pipe and will get stuck. The only way to get out of this is to reset the game, or wait for time to expire.

                        im outta here