The same area can be acessed from a pipe in the same place in 4-2. This pipe will take you to world 5, level 1. Walk over to the warp zone area and enter the middle pipe. If done just right, Mario will slide through the pipe and the bricks. Duck, then jump backwards as far right as possible. Then, position Mario on the edge of the pipe, with one foot hanging off the edge. Jump up and break the block over top of the part of the pipe farthest left. Go to the pipe at the end of the level and jump on top of it. To access this warp, you must be Super or Fiery Mario. If you just walk along the sea floor, Bloopers will never be able to kill you because they are forced back up just before they hit the floor(or you). At the very end place of world 4-2 (where you can see the pipe going to the flag) jump on the long pipe and break the brick above it and go through the end and you can see the pipe going to the World 5. Get some coins if you wish and you can now see three pipes like in the secret warp Worlds 2,3 and 4. Climb until you reach the day light again. Anyway, step on to the 2nd block then braek the 1st block and there you can see the vine going up.

The position of the two revealed blocks must be a stair from right to left. After you have done this, go down, then jump again below the second block now (it should have been broken now). Then step on to it and break the 2nd and the 3rd block. Jump below the third block where you can reveal a secret block but be careful on jumping below the 1st block because you can't break it thus going to the secret warp world unless you are a small Mario. To warp to World 6,7 or 8 during World 4-2, go to the place where three blocks are can be seen (where a pipe can also be seen). When they touch you while you are small Mario after getting the Mushroom or Fire Flower, you will turn back into Big Mario.)

(Note: after you do the Bowser/Axe trick, enemies that touch you will be able to kill you when you are Big Mario. Then get a Fire Flower, and you'll have Fire Power as small Mario. (Yes, there will be a Mushroom instead of a Fire Flower.) When you touch the Mushroom, you will shrink. Go to the next stage, and get a Mushroom. If you do it correctly, you will hear the sound as if you were to shrink, but you will just flash and stay big. As he gets near you, jump high, and touch Bowser and the Axe at the same time. Stand near the Axe and Bowser will start to walk towards you. Make sure you are Big Mario and try to jump over Bowser or run under him. For example, if you touch the flagpole with 126 seconds left on the time, you will get six fireworks! If you touch the flagpole of any level with either 1, 3, or 6 seconds left on the ones place of the timer, you will get that amount of fireworks. Walk foward and drop down the small jump, and you can now warp to Worlds 2, 3, or 4 by going down the desired tube, and pressing down. To warp to Worlds 2, 3,or 4 during World 1-2, go to the end where the 2 platforms are rising, get on the first platform, and use it to jump onto the highest structure in the middle, then jump on the next rising platform, but this time, when it reaches the top, jump onto the TOP of the level. Jump down the first pipe you see and you will be in the Negative World (-1)! You should go through the wall and pipe into a warp zone. Now duck and jump backward toward the brick (don't break it!). At the pipe that leads to the flag, break two blocks so there's one at the end touching the pipe. From here, jump on it and keep yourself off the ground for unlimited 1-ups. Jumping over the first one and then jumping on the second one should cause it to hit the star and bounce back. At the end of the level, by the staircase before the end flag, you will see two turtles coming down the stairs. Get to world 3-1, and become Super Mario.

Play the old super mario bros