Yes, I was referring to SMA2. Since you're playing the original one, it doesn't matter.
Here's what GameFaqs says:
TUBULAR (Difficulty: Insane)
This is one of the hardest levels in the game! Interestingly,
this level is easier if you're tiny Mario because you're a
smaller target! Don't worry: you'll die and become small Mario
anyway. Jump from pipe to pipe, avoiding the enemies.
(For this level you'll need a blue Yoshi, and a feather. Make
your way across the pipes on blue Yoshi. True, if you bounce on a
Charging Chuck here you can go up high, but in this area you can
easily miss the pipe that you'll have to land on, so play it
safe. Once you reach the final pipe with the P-Switch next to it,
take a deep breath, hit the switch, take a quick step back, and
run and jump! If performed correctly, you should first land on a
question mark block. Jump quickly again to be able to land on a
charging chuck and bounce back up just enough to land on the
brown blocks. Hurry! These blocks disappear quickly: Eat one of
the two flying Koopas that are hovering next to you and fly. Dive
under the two fire-spitting plants, and a second latter
carefully fly between the chucks kicking footballs(remember, if
you lose Yoshi you're toast, so don't get hit!), under two more
fire-spitter plants, and you'll be at the goal! But be
forewarned, this maneuver takes exactly if not just over the time
that Yoshi can hold a shell in his mouth without swallowing. You
should either sail majestically through the goal, or sink right
in front of it. If the latter happens, you can still jump off of
Yoshi just in time and to safety.)
It's a bit hard, but any way to get through this insane level is
fine by me! Although, it can get annoying to go back to Top
Secret Area and power-up again.
(Y1) Above the second Charging Chuck.
Hit the POW and jump down onto the spring, hit the ? block and
grab the balloon. If you get hit, you will plummet to your
death. Fun.
(Y2) Underneath a ? block after getting the balloon.
(Y3) Near the top of the screen.
After the third dragon coin, you should see a ? block. Make
sure you're not wasting time trying to hit all the ? blocks!
This is the only one you need right now as it contains another
balloon which will refill your... gas? You should see two fire
plants. Fly in between the fire of the top and bottom ones,
going for the dragon coin.
(Y4) In between two fire plants.
After this, start to float low, going under the jumping
pirhana plant. Go under the Charging Chuck while avoiding his
football and hit the ? block: another balloon will fly out.
Grab it without getting hit by the footballs flying from
above.
(Y5) There will be two more dragon coins. You only need to
get one of them. I prefer the first one, as it is less
dangerous.
Keep on flying, avoiding all enemies and you'll make it to the
end of this insanely difficult level.
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Morning: Life''s little reboot button
