In world 2 level 4 there is a coin,that i cannot reach as i cannot jump high enough and the other way is blocked by a stone.how do i get there???

Here try this one.
WORLD 5-4
You can find the Star Coin at this stage of this world. Look at the photo.

• At this stage, you should pick up a Bob-Bomb and then quickly jump to the ledge.
• Drop the Bob-Bomb in the white blocks to get rid of some of it and then drop down to the raft.
• The Star Coin should now appear.
  
• pick it up and then enter the pipe above.

WORLD 6-5
You can find the last Star Coin in a Secret Area with a Secret Goal.

• Look for the four item box in the water. like in this photo.
• You will need to jump or swim in the middle of the four boxes to reveal a hidden box that contains a beanstalk.
• Climb up the beanstalk to reach the other area.
• In the Other Area, you will need to pick up a propeller block.
• Get the coins and the go right to the second floating box.
• From this box, you will need to spin to reach the Star Coin and the Secret Goal.

WORLD 7-6

• After you came across some small parabeetles,then you should come to a line of big parabeetles.like in this photo.
  
• Look down low and you should see the Star Coin poking above the low clouds.
• Ride down to the Star Coin using the Last Big Parabeetle.
• Then wait for the small parabeetles. and then Jump down to get the coin and step on the small parabeetle. (Be careful in this part, you should jump at the right timing so that you wont fall off the clouds.)

WORLD 8-7

• You should ride the next platform down as you jump a geyser like in the photo.
• Stay near the front of the the platform so that you can grab the Star Coin before hitting the geyser.
• After getting the Star Coin, quickly jump to the platform above you to avoid the geyser.

Thats it. Goodluck, Hope my solution helped. Please give some feedback regarding my solution.

Thank you for using Fixya! Have a Great Day!

I don't know how to open the cannons but i do know how to get to worlds 4 & 7. Ok.
All you have to do is beat world 2's boss, while you are mini mario, to get to world 4. and beat world 6's boss, while you are mini mario, to get to world 7. :)

here is the complete run through for world 2-2
This level will reintroduce everyone to that rapscallion in the flying cloud
(Lakitu) and his pets he throws about (Spiny)! Take on the three Red Koopa
Troopas if you wish to, but mainly concentrate on getting the Power-Up while
moving right, passing the ledge to see Lakitu come out from behind the
nearby Pyramid! Lakitu will throw his pet Spinies at Mario, but if Mario
can take out Lakitu, he will not return for a short while, and Mario may be
able to even hitch a ride in that cloud! Run right to find a couple high ?
Blocks (one has a Power-Up) to attack Lakitu from, and if Firepower is
yours, use it to take Lakitu from his perch, followed by stealing his ride!

With the cloud in hand, fly right until a coin path upwards appear, so
follow it to locate the first Star Coin. Jump off the cloud and run right
past more Red Koopa Troopas, jumping a gap when the Piranha Plant retreats
into his pipe, finding some bricks to Ground Pound through to grab the
second Star Coin. Lakitu should have returned by now, so be wary of him as
you move to the right, finding a structure with bricks and ? Blocks in it
(note that this a tribute to a structure in the first Lakitu level ever, in
SMB's 4-1) to bust up as you desire, followed by locating a green pipe to go
down, which will launch Mario high into the air, directly at a pipe above
(press UP to go inside).

Use the dual set of green pipes here tog et the Coins and third Star Coin,
then head down the pipe on the right to return to the main level area. Move
to the right, suing the rocking toadstool to go jump onto the flagpole,
ending the level!
hope this helps........any more ????
email me on [email protected]

-Taken From GameFAQ's-

==============================
World 4-4: Six-Face Sal's Fort
==============================

Flower 1
--------

Starting off, go right and hop across the yellow platforms. When you reach
the lava monster, wait for it to stop spewing its lava stream in the air; if
you touch it, you die. When it stops, continue to the right, hopping across
rotating platforms. Pick up the red #1 ball when you reach it, then throw it
in its slot on the wall. After the metal gate opens, continue to the right
and eat the Shy Guy. There will be three sets of yellow platforms ahead. Hop
from the first set to the higher middle set. Jump above the platforms to get
two red coins (2), then continue to the right.

To the right, you will come to a series of purple platforms attached to a
gear. Hop on the right ledges to raise the block to the right. Once it's
fully raised, jump from the highest platform on the wheel onto the block.
Shoot the winged cloud above the block to get the first Flower.

Flower 2
--------

After you get the first flower, drop to the ground and head right into the
next room. There, go right and jump to the ledges above. In the upper-left
corner, you can reveal a hidden winged cloud containing five stars. Go
through the Middle Ring to the right, and look above to see three targets for
the numbered balls. You don't have any right now, so drop to the bottom area
and follow the coin line to the right.

At the Stork Stop, switch to Baby Mario, then continue right along the bottom
path. Make eggs from the Shy Guys that spawn from the pipe, then enter the
door to the right of it. Pick up the red #1 ball sitting there, then exit the
room. Jump onto the pipe and then to the thin ledges above it. Hop up the
ledges to reach the upper-left area. Ride the green platform upward, then run
to the right past the spike pit. At the other end, collect two red coins (4)
and the green #2 ball.

Now, quickly run back to the left as the floor rises to escape. Drop to the
area below and head directly to the right this time. When you reach the
upper-right ledge, go right and enter that room. Lower the two blocks by
turning the gears (stand on the right side of the wheels). Then, hop onto the
right block and flutter to the left one. Go left and up the first hill, then
jump onto a ledge with a Stork Stop on it.

Switch to Baby DK and hang from the ceiling to get across the spike pit to
the right. At the far right, drop to the ledge below and enter that room.
Switch to Baby Mario and run to the left, and pick up the Key. As soon as you
touch the Key, the ceiling will start to collapse, so quickly run back right
to escape. Switch back to Baby DK when you reach the door, then exit the room
and get back across the spike pit.

Now, continue up the path to the pipe at the top of the hill. Go through it,
then when you arrive in the next room, flutter onto the right ledge. Go right
and shoot an egg upward to grab the second Flower.

Flower 3
--------

Drop off the platform to the ledge below, and go through the door there. Pass
through the Middle Ring and go right to some platforms. Hop from the yellow
ones to the ledge above. Collect the coins up there and run to the left where
you will find the next Flower.

Flower 4
--------

From where you grabbed the previous flower, jump to the ledges above and go
left to the pipe. Go down the pipe and enter the door when you land. This
time in the room, go right and hop on the left purple platforms to turn the
gear, which will roll out a ledge below. When the gear stops turning, drop to
the ledge directly below the winged cloud. Shoot the cloud to make a red
switch fall onto the platform. Before you hit it though, go left and drop to
the area to the left of the ledge that moved. Head left and drop onto the
thin ledges, then jump to the stakes in the lava below. Jump to the right to
grab the fourth Flower.

Flower 5
--------

Shoot the winged cloud above the left platform to get five stars. Then, jump
across the ledges and head back to the right. Hit the red switch and run to
the right along the block path, collecting two more red coins (6). At the
other side, jump up the ledges and collect the yellow #3 ball. Quickly drop
back down and wait for the blocks to disappear. Then, drop to the platform
below and collect two red coins (8) above the stake to the left. After that,
go through the door.

Back in this room, go all the way to the far left end of the room. Jump to
the ledges above and unlock the door with your Key. In that room, use the
Stork Stop and switch to Baby Mario if you don't already have him. Jump onto
the M blocks and then make your way upward along the small ledges and other M
blocks. When you reach the top, enter the door on the right side. There, jump
onto the purple platform and ride it downward along the track. When it moves
under the spikes on the low ceiling, duck to avoid getting hit by them. When
you reach the winged cloud, shoot it to reveal a Flower. Shoot a second egg
to claim it.

Boss Battle
-----------

Continue riding the platform upward along the track to the end. You will
collect two red coins (10) as you approach the top. Once you get there, go
down the pipe. Fall into the next room and land on the ledge below to find
two more red coins (12), then jump to collect the Character Coin to the right
with Baby Mario. To the left of the coin is a hidden winged cloud you can
jump and reveal; shoot an egg at it to get five stars. When you're done, go
through the door at the bottom to exit.

When you appear in the main room again, grab the two red coins (14) to the
left. Then, run to the right and jump to the upper-right ledge. Go right and
look up at the colored targets, and throw each number ball at the appropriate
target. Doing this will raise a block to the right, so go ahead and enter
that new room. Ride the platform on the track to the right, collecting four
more red coins (18) along the way. At the end of the track, go through the
door to reach a new room.

Use the Stork Stop and switch to Baby Mario if you don't already have him,
then start running to the right. As the ceiling blocks start to fall, keep
running and collecting the coins. One row of coins towards the end will be in
the air, so you will have to quickly jump to get them, including the last two
red coins (20). At the end, go through the Middle Ring, then open the red
door. In the boss room, go up the hill and bounce to the area above, where
you will meet Six-Face Sal.

The boss consists of six faces on a giant wheel which hangs on the top screen
above you. The bottom half consists of a long platform of donut blocks which
sink if you stand on them for too long, and four purple platforms which turn
the gear when you jump on the sides. The battle will start off with one of
the heads coming out and dropping spiked balls onto you. To attack, turn the
wheel by hopping on the platforms, then when the head you want to attack is
at the bottom end of the giant wheel, shoot an egg up at it.

After the first hit, there will now be multiple heads popping out to attack.
Some heads will be red, but only one will have a pale, light color to it.
That's the one you should be looking to attack. After several rounds of this,
at one point having all the heads attacking you at once, the battle will end
after you attack successfully several times.

level 7-2 is the White Mushroom House level, so go into this level trying to collect all the Coins possible to win yourself a great prize. This level requires you to collect a minimum of 46 Coins to make the White Mushroom House appear. Wear a Frog Suit if you attempt to get this challenge done. Go right past the Nipper to use an Ice Block on the left ? Block to find a Power-Up, and then head down the next pipe. Go to the far left to collect the Coins, trigger the P-Switch, and then swim right at top speed to collect as many Coins as possibly before they revert to bricks (note that this is impossible to do without the use of a Frog Suit though).
Head back up topside to fight Nippers and Venus Fire Traps as you head right to jump into a large area where a Green Paratroopa Koopa is (kill it). Now jump up to reveal hidden Note Blocks all the way across this area before heading down the pipe on the right for a Power-Up before heading down the pipe on the left.
Swim to the pipe on the left, head topside, turn right to go across the Note Block bridge (jump straight up off the seventh from the left Note Block to reveal a hidden 1-Up Mushroom), and then continue right to go down the first pipe you see leading into the ground to fight Nippers and a Pirahna Plant as you go right to get a Power-Up.
Head back topside (using the pipe you came down in) to go right past a slew of Venus Fire Traps, a Pirahna Plant, and a Nipper to find the one short pipe that leads underground to another pipe for Mario to take. Run off to the right to find the Slot Box and finish the level!

hi liz , that is a tuffy , i tried hundreds of times , your spossed to be able to jump the dry bones , then get a running start and jump to the right wall , then wall jump back to the upper part of the left wall then to the right and back to the left where you will be at the warp pipe that leads to the 3rd coin , how ever i have not been able to accomplish that in 200 tries , so i got a mini mario in my circle to use when i get there , get to that last door area and mini will do the wall jump just fine , go up the warp pipe and hold on , 4 spiked bars from all directions , dont panic , wait for the cycle , jump to the 1st landing ,then up 1 more to the right and back to the coin , stop at as far left as you can when you get the coin and duck , wait for the next cycle then return the way you got up there and go back down the warp pipe , go back down to the door that dry bones is guarding , enter the door , now you have to stomp bowser jr 3 times as a mini , its tuff but not as hard as wall jumping .

here is a great walk thru link that helped me complete the game 3 times .

http://guides.ign.com/guides/682879/page_21.html

the link i set at world 6 so scroll down to tower level , and see good pics of what to do .
good luck with the game , as hard as some levels are don't give up .
the best tip i could give is to go back to world 1-1 after each level complete and get 2 flowers and extra 1 ups before going into your next level so you are prepared .

J5

When you get on the board that goes around in circles, wait till the gold question mark flies by. Jump on it and wait till it gets to the wall. Now can you help me find the last coin in the last level of world 6 and how to get the last coin on world 7?

go to the final platform that sways up and down right before the warp pipe that takes you to the flag pole. wait until the platform goes up on the right. jump on the rocks on the top of the screen,then dash. then you will see the 3rd coin.

First of all you will need SMALL MARIO for this.
Play the level to the last green pipe that you have to go through (this is the pipe where you need to stomp on a red switch to be able to step and and get through the pipe). Once you step on the switch, proceed to the green pipe. Instead of going through the pipe, hop on top of it and on your far right, you will see a platform. You need to wall jump from the pipe to reach that platform. Once on the platform, go up the steps and then you'll get into a space (where the door is). The LAST COIN is on top of this little room. Just wall jump left to right until you get to the top of the room for the coin and finish the game. Cheers

I'm guessing you mean "islands in level 2A I can not get on them"? If you just don't have the timing right theres nothing that can be done. If not please refer to the walk through.

Move right to find a Power-Up in a ? Block, followed by dealing with the
Koopa Troopas and dodging the massive fish trying to eat Mario from below,
appropriately titled Spike Bass due to his spiky exterior. Keep away from
him while moving on, taking the lower log path to get the first Star Coin
(draw an attack from Spike Bass first, then sprint through to get the Star
Coin easily).

Next up are some springboards, so use them to launch high into the air,
collecting Coins and finding the second Star Coin high in the sky before
advancing to find a Red Koopa Troopa, at which point the paths in the level
diverge.

==========
Main Route
==========

Go past the Red Koopa Troopa and into the green pipe, swimming upwards upon
exiting to find a springboard. use this one to launch high into th air,
holding RIGHT to land on the flagpole for a good score, ending the level and
unlocking the path to the Pipe!

===============
Alternate Route
===============

Perform a spinning jump from a springboard to land off the Red Koopa Troopa,
bouncing back into the air to reach the pipe on the ledge above. Grab the
third Star Coin in this contained area before taking another pipe, this one
leading to an alternate exit flagpole, which unlocks the Warp Cannon that
goes to World Five!