To access this warp, you must be Super or Fiery Mario. Go to the pipe at the end of the level and jump on top of it. Jump up and break the block over top of the part of the pipe farthest left. Then, position Mario on the edge of the pipe, with one foot hanging off the edge. Duck, then jump backwards as far right as possible. If done just right, Mario will slide through the pipe and the bricks. Walk over to the warp zone area and enter the middle pipe. This pipe will take you to world 5, level 1. The same area can be acessed from a pipe in the same place in 4-2. However, this is meant to be a warp zone to 5-1, whereas the 1-2 warp to 5-1 is a glitch. After completing the jump trick in level 1-2, you can also go down either of the other two pipes, both of which will take you to Minus World -1.
Contributed By: nintendoman666
48 25
This only works with mushrooms and fire flowers. Reveal a power up from under any block which contains one. Now jump onto the power up and release the A button. As Mario is transitioning to the next power up, hold down the A button, and Mario will jump in mid-air!
Contributed By: TheUltimateM4
35 10
This one's pretty infamous to Speed runners, at any level Except any levels with -4, Jump Precisely at the end of the Flagpole staircase and get close enough to the block that the flagpole stands on and (while in the air) and when you see that you are about to crash into the block and land on the ground there's a brief few frames where you can jump off the Flagpole block on to the Flagpole for a much shorter time to go down the pole as you should be at the very bottom of it. This trick is mainly used in speed runs of the game, so it doesn't really help (unless you're in a rush or Speed Running the game).
Contributed By: Modern_glitches
5 3
This allows Mario (or Luigi), to move forward while looking backwards. While playing in any level, press and hold left. (While not letting go of left) press and hold down right. Just keep hold these two buttons and Mario will walk backwards very slowly. To speed him up, jump. If you keep holding the two buttons and press jump he will jump backwards and walk backwards faster. Also if you have gotten a fire flower, you can throw them while he walks backwards. If you throw some they will be a lot faster than normal and they will bounce much further. (You could also challenge yourself by trying to beat the game while going backwards!) ; ) (only one problem. Mario can't go backwards into pipes, so you have to go forwards there.)
Contributed By: merrdog20
13 23
Go to World 1-2. At the pipe that leads to the flag, break two blocks so there's one at the end touching the pipe. Now duck and jump backward toward the brick (don't break it!). You should go through the wall and pipe into a warp zone. Jump down the first pipe you see and you will be in the Negative World (-1)!
Contributed By: ironcladgranite
39 14
Go to either 1-4, 2-4,3-4, etc. and get to Bowser. Make sure you are Big Mario and try to jump over Bowser or run under him. Stand near the Axe and Bowser will start to walk towards you. As he gets near you, jump high, and touch Bowser and the Axe at the same time. If you do it correctly, you will hear the sound as if you were to shrink, but you will just flash and stay as Big Mario. Go to the next stage, and get a Mushroom. (Yes, there will be a Mushroom instead of a Fire Flower.) When you touch the Mushroom, you will shrink. Then get a Fire Flower, and you'll have Fire Power as Small Mario. (Note: after you do the Bowser/Axe trick, enemies that touch you will be able to kill you when you are Big Mario. When they touch you while you are Small Mario after getting the Mushroom or Fire Flower, you will turn back into Big Mario.)
Contributed By: Lhunthangion
18 7
Go to either 1-4, 2-4,3-4, etc. and get to Bowser. Make sure you are Big Mario and try to jump over Bowser or run under him. Stand near the Axe and Bowser will start to walk towards you. As he gets near you, jump high, and touch Bowser and the Axe at the same time. If you do it correctly, you will hear the sound as if you were to shrink, but you will just flash and stay big. Go to the next stage, and get a Mushroom. (Yes, there will be a Mushroom instead of a Fire Flower.) When you touch the Mushroom, you will shrink. Then get a Fire Flower, and you'll have Fire Power as small Mario. (Note: after you do the Bowser/Axe trick, enemies that touch you will be able to kill you when you are Big Mario. When they touch you while you are small Mario after getting the Mushroom or Fire Flower, you will turn back into Big Mario.)
Contributed By: Lhunthangion
36 12
This only works in 2P mode. The 2nd player (Luigi) must make it to world 5-2, not kill the 2nd hammer brother (guarding the vine/beanstalk), activate the vine, then begin to climb while awaiting to die by a thrown hammer. Luigi must die while on/climbing the vine.
When player 1 (Mario) starts again, a short vine will begin to sprout where he's standing. There is only one practical application for this: during the 2nd quest, where Goombas are turned into Beetles, if a vine/beanstalk sprouts in 1-2, Mario can farm lives by knocking the beetle against the left wall, climb on the vine, and endlessly kick the beetle between the wall and the vine without ever touching the ground.
Contributed By: ZoqFotPik
9 4
To reach this area, stand on the pipe in World 1-2 that takes you to the flagpole. Break the 2nd and 3rd blocks from the right. Then, face left and jump. Hit the back of your head on the left side of the brick next to the pipe. If you do it right, you should be pulled through the wall. Quickly jump into the left pipe to enter the Minus World. It consists of three levels (going to -3) where you can beat the game.
Contributed By: MTRodaba2468
26 5
This glitch only works in the castle levels where you fight Bowser at the end - for example, World 1-4, 2-4, 3-4, and so on. It is best to defeat Bowser with Fire Mario or Fire Luigi beforehand, as you must wait out most of the timer to execute this glitch. At the end of the castle levels, there is an axe which you must touch to end the level. If you time your jump correctly (a full jump as the timer goes from 002 to 001 often works) and land on the axe while the timer reads "000", you'll continue as normal to the usual sequence at the end of the castle. However, your timer bonus (50 points per second remaining) will be calculated as if you had 999 seconds, not zero, left on the clock. This allows for an easy 49,950 point boost! Note that this glitch, if executed on levels using a flagpole, will prevent you from earning the bonus in that level.
Contributed By: Anonymous
4 1
Get to world 3-1, and become Super Mario. At the end of the level, by the staircase before the end flag, you will see two turtles coming down the stairs. Jumping over the first one and then jumping on the second one should cause it to hit the star and bounce back. From here, jump on it and keep yourself off the ground for unlimited 1-ups.
Contributed By: CommanderSouth
56 21
In World 1-2, execute the Minus World glitch as described above. However, rather than enter the leftmost warp pipe, enter the one in the middle of the three that are normally there. This would normally take you to World 3 - however, it will now bring you to World 5.
Contributed By: Anonymous
12 2
In World 1-2, execute the Minus World glitch as described below. However, rather than enter the leftmost warp pipe, enter the one in the middle of the three that are normally there. This would normally take you to World 3 - however, it will now bring you to World 5.
Contributed By: Anonymous