You know a couple of these as a child, however the rest are brand new information to me. Dive in:
1- Jump over the flagpole
If you time the leap perfectly, on World 3-3 you can hop over the flagpole and continue to run.
As you leave a passage or enter another World, hop and shoot a fireball and press right.
3- Maximum fireworks
As you hit the flagpole, the clock in the upper right stops. If that number finishes in 1, 3, or 6, you will get the relating number of fireworks.
4- Infinite 1-Ups
As the second one is as yet on the stairs, bounce on it to place it into shell-mode, at that point stand one stage beneath where the shell lies. Presently hop on the shell. If you time it right, you will ricochet off the shell again and again, so you get many points and 1-UPs.
5- Win and die simultaneously
If Mario hits Bowser on World 8-4 at the right time he hits the hatchet, Mario dies. In any case, he actually wins.
6- Become a small Fire Mario
You need to get a Mushroom and a Fire Flower, which obviously makes you Small Fire Mario. As Small Fire Mario lets out a fireball, he momentarily becomes ordinary Fire Mario.
7- Vine dancing
As you arrive at the highest point of a plant, keep pressing up, and you will move.
8- Reach World-1
If you do a unique crouch-jump on World 1-2, you enter a glitched-out Warp Zone that carries you to “World – 1,” a water world indistinguishable from World 7-2.
9- Useful coins
As you gather 20 coins, you can press X to trade them for a power up. It may be a Super Mushroom, Super Star or even a POW block.
KoopaTroopas abandon their shell after you hop on their head. If you push this shell, it transforms into a deadly shot, devastating to all in its way.
The above given tips will definitely make your game more interesting. If you do not have Super Mario Bros game installed, don’t worry. You can play the game online here https://supermarioplay.com