Well, here it is.Most of these levels you will need no help with.Certainly you will need no help with the first level, but it demonstrates some basics of the game.

*World 1:

Level 1 =
      Wow, what a difficult level.  Well, if you haven't played before at 
all, it might be a bit difficult.  Ok, in the first ? block there is a coin, 
but in the second is a mushroom.  Bounce on the goomba to kill him.  Ok, 
Jump over the first three pipes, wither avoiding or stomping on the goombas. 
  The fourth pipe is a warp to the near end of the level.  If you take it 
right away, scroll down to the *.  However, you can get an extra life and 
still take it or you can continue playing normally.  Right after the pipe is 
a hidden block above the left-most side of a small hill in the bg graphics.  
Jump and out comes the 1-up.  If you do it without moving too much to the 
right, you can still take the pipe.  Otherwise, continue.
      All right, under the second block coming up next is a Flower if you 
are super Mario, and a mushroom if not.  Get it, without getting hit by 
goombas.  Under the next ? is 11 coins.  Then is a group of 2 boxes, the 
second one contains a star.  After the star is a pyramid of ? boxes.  The 
top one contains a flower, the three bottom contain coins.
      Next is just a series of stars and holes.  Jump over the holes to get 
across.
      *
      Here is just a row of boxes, the ? one contains a coin.  To get 5000 
on the flag step all the way to the right of the top part of the stairs as 
far as you can without falling off.  Now, hold down B and press right until 
you get to the very end of the platform and push and hold Jump.

Level 2 =
      This is the first underground level you go to.  The first ? block is a 
Power Up.  The first regular box you see contains 9 coins.  Now comes a 
thing that looks like a badly written W.  at the very end of the W the top 
box contains a star.  After the row of coins on some boxes, there is a thing 
hanging down that looks like a backwards J.  The top block on the right part 
of the backwards J is a Power Up.
      Coming up is a rectangle with some coins on top.  Get on the platform 
before it and run and jump to get on it.  Directly above the last coin is a 
1-up.  Break the box in front of it to make it drop down so you can get to 
it.  The first pipe is a warp that leads to the third pipe.
      The last in the row of blocks under the red turtle contains a Power 
Up.  ride the elevator to the top and run to the right to access the level 
jump.  One pipe goes to level 2, one to 3, and one to level 4.

Level 3 =
      Tree type place.  You come to an elevator and a ? block very early 
that contains a Power Up.  The last elevator above a red turtle leads to the 
stairs going up to the flag.

Level 4 =
      Your first castle.  Make sure if you try to get the ? block that you 
avoid the fire thing.  It contains either a mushroom or a fire flower.  The 
first ditch you come to has a hidden coin block 4 block spaces from the end. 
  Just jump to get it.
      When you get to King Koopa, either jump on the little ride thingy at 
the top or run under him when he jumps.  Don't let him touch you.  If you 
have fire Mario you can shoot him about 5 times and he'll die.  Otherwise, 
get the axe hammer thing at the end of the bridge and kill him.  Now Toad 
will tell you that the princess is in another castle, what a waist of your 
time.  Oh Well, keep going.

*World 2:

Level 1 =
      In the middle of the first three boxes you come to is a Power Up.  
Some ways ahead is two rows of ? boxes.  The first ? box on the bottom row 
is a Power Up.  There are two more rows of ? blocks, only horizontal instead 
of on top of each other.  Above the two rows is 5 normal blocks.  The middle 
one contains a vine that leads to a cloud secret.  If you don't take the 
cloud warp, there is a pipe warp right after where the vine is.  The first 
box after the pipe warp is a Power Up.  After the following pipe and the 
ditch, you have to jump on a springboard to get to the platform before the 
flag.

Level 2 =
      The first underwater level.  Avoid the fish (easy) and avoid the squid 
that can control their own movement.  When the ground disappears, be careful 
because you can get sucked down.

Level 3 =
      Keep running as much as you can (after a while you can tell if a fish 
is gonna hit you.)  There is a ? box with a Power Up in it.

Level 4 =
      The ? box has a Power Up of course.  When you have a chance to either 
take the top route or the bottom route, take the bottom.  There are less 
flame thingies.  When you get to the Koopa, break the boxes with super Mario 
to take the elevator platform over his head.

*World 3:

Level 1 =
      Dark World!!!!  The third ? block contains a power up.  The second 
pipe is a warp.  After the warp is a star.  You should be able to use the 
star power to kill the hammer bros. and then get the Power Up in the second 
box above them.  The first box in the second row of boxes after the 
springboard has a vine that leads to a cloud warp.  If you don't take the 
vine, a box after the vine contains a power  up.  Before the end is a last 
row of boxes.  the second box contains coins.

Level 2 =
      The first ? box contains a Power Up.  Above one turtle that is trapped 
between some bricks is two boxes.  The bottom box contains some coins, the 
top contains a star.

Level 3 =
      There are two elevators right at the start of the level.  The first ? 
is a Power Up.  Watch out for dropping elevators and the pairs of elevators 
that make each other rise and fall.

NOTE: In this level, you can use the 'Jump Over the Flag Pole' cheat in the 
ceats and codes section.

Level 4 =
      Watch out for the flames that jump up from the pits at the beginning.  
The second ? contains a Power Up.

*World 4:

Level 1 =
      Arghhh...a Lakitu level.  It is very useful to have Fire Mario in this 
level.  The first ? has a Power Up.  If you warped in level 1-2, there is a 
hidden 1-up block on top of the row of four ? boxes. It won't be there if 
you didn't level jump.  The third pipe coming up is a warp.  There is a coin 
box right next to the flag.

Level 2 =
      This is an underground level.  The first box under the little part 
with the coins has a Power Up in it.  There is some hidden coins near the 
end of the hallway with three goombas 2 blocks up from where the last goomba 
is when you first see him (5 boxes from the end).  Now there are two groups 
of two ? boxes and one group of three.  The middle one in the group of three 
is a power up.  Across the ditch there are three boxes just sitting there.  
Jump directly under the second to the right and last to the right.  Jump 
onto the new block stairs so that you can hit the first normal block from 
the right.  This leads to a group of sick mushrooms with a warp to either 6, 
7, or 8.  If you don't go, there is a warp pipe right after the high pipe.  
The first box before the strip of boxes with coins on top of them is a power 
up.

Level 3 =
      The sick mushrooms level (notice that all the giant mushrooms have 
chicken pox?).  Anyway.... The ? box has a power up.  Watch out for those 
pulling elevators.  The last elevator leads to the flag instead of stairs.  
THERE ARE NO STAIRS!!!  You gotta jump from the elevator.

Level 4 =
      This is the first castle that has somewhat of a maze.  You have to 
take this route:
      The first time you can choose between a high route and a low route, 
take the top.  Run until you reach another place where you can choose.  Jump 
down to the bottom and it will lead you to Koopa.

*World 5:

Level 1 =
      At one point, after the second paratroopa, there are three blocks.  
The middle one contains a starman.  This level has the first bullet bills in 
it.  Try to either jump on them or crouch under them if you can.  There is a 
pipe in the air that warps near the end of the level.

Level 2 =
      At the beginning, the last of the top row of blocks has a power up.  
The first pipe goes to a swimming warp.  Watch out for the lowering 
elevators while swimming, they push you into sink holes.  The last block on 
top of the two rows after the warp has a starman.  Then there are two blocks 
that only regular small Mario can reach.  The first contains coins, the 
second a Power Up (mushroom for small Mario).

Level 3 =
      Just exactly like World 1 - Level 3, the tree level.  There are more 
enemies and smaller elevators, and bullet bills are being launched at you 
the whole level.

Level 4 =
      At the beginning, there is an extra long fire thing near the ? block 
with the Power Up in it.  Take the bottom route to reach Roy Koopa, the 
fifth Koopa.

*World 6:

Level 1 =
      Lukitu level! This is another dark level.  The first normal block 
contains a power up.  the third ? block also contains a power up.

Level 2 =
      Another dark level.  The first pipe is a warp.  the second pipe after 
the warp is a water warp.  If you don't take the water warp, there are two 
rows of blocks overhead.  The last block of the second row is a warp vine 
that leads to a cloud ride.

Level 3 =
      This level is all gray for some strange reason.  the first ? box is a 
power up.  About half way through this level, Bullet Bills start launching 
at you.

Level 4 =
      Same exact as the first castle, except for the Koopa at the end is 
using hammers.  It is really good to have Fiery Mario at this Koopa.

*World 7:

Level 1 =
      First normal block holds a Power Up.  There are a lot of Bullet Bills 
in this level.  There is a block with a power up at the very top of the 
springboard.  It is kinda hard to reach if you get a flower, and if you get 
a mushroom, chances are you will miss it.

Level 2 =
      A water level.  A LOT OF SQUIDS!!!!!

Level 3 =
      Another flying fish level, exact same lay out as level 2 -3.  However, 
there are more fish, and Koopa Troopas and Koopa Paratroopas are in your 
way.  There is still a power up in the middle that you want for the 
following castle.

Level 4 =
      Hmmm...the last castle before the big Bowser Koopa castle.  This is 
the maze palace of Ludwig Van Koopa.  For the first three parts, go Bottom, 
Middle, Top.  Then you will come to two big ditches of lava on the bottom, 
and a fire thing at the top.  This one changes I think, but what I did was 
went on top, avoiding the fire thing, and then stayed on top, jumping the 
ditches.  This led me to Ludwig Van Koopa.

*World 8:

Level 1 =
      If you used a Level Warp to get here from level 4, there's a hidden 
1-up above a Buzzy Beetle that's trapped between two pipes.  There is a pipe 
warp in a pipe before three Goombas.  There is also a trapped Koopa 
Paratroopa with a row of blocks above it.  In the middle of where it is 
trapped is a hidden box.  If you jump on the box, you can hit the regular 
box above it that contains some coins.  After the next series of short 
ditches is a row of blocks, the third is a starman.

Level 2 =
      There is a 1-up in the box above the springboard.  Between the first 
set of bullet bills, there is two blocks.  The second one is a Power Up.  
The first pipe after the difficult jump (where you're on a pipe and you have 
to run just right to not fall down a pit) is a warp.

Level 3 =
      The first set of hammer bros. are on two rows of blocks.  The second 
to last block on the top row is a power up.  Then the next set of hammer 
bros. is also on two rows of blocks.  For that set, the second to first 
block on top is a power up.

Level 4 =
      Well, here it is...the giant maze castle...the home of Bowser Koopa.  
Actually, I figured this level out quicker than the World 7 castle (Ludwig 
Van Koopa's castle).
      Ok, there’s a ditch with a little elevator that moves across some ways 
into the level, right after it, enter the first pipe.  Then, there’s a pipe 
in the air by some Koopa Paratroopas.  There’s a hidden block near the left 
of it that will help you get into it.  After that pipe, you will have to 
jump over a pit with lava in it.  Right after it, jump into the pipe.  This 
takes you to a swimming level with spinning fire rods and 3 squidies.  If 
you have fiery Mario, you can kill the coming up Hammer Brother, otherwise 
try to run under it.  Now, avoid the Podobo to get to Bowser Koopa.  It is 
very easy to kill Bowser with fireballs.  It is hard to get on top of him, 
and he has hammers, so it’s hazardous to try to go under him.  Do what you 
must.

Well, I guess since you’ve reached the end, the only thing you can do 
is.do it again!The second quest has more baddies, a lot more bullet 
bills, and all the baddies other than Koopa Troopas turn into Buzzy Beetles. 
Have fun!