Super Mario Bros.

Cheats

Continue Game Play

When the “Game Over” screen appears, hold the A button. Keep this button held when the title screen appears and press START to continue at the last world where you left off. This cheat can also be achieved by holding A at the title screen and pressing START twice or by holding A and B and pressing START at the “Game Over” screen.

Fireworks

For fireworks to appear at the end of the level, jump through the flagpole when the last digit on the timer is a 1, 3 or 6.

Have fire power while small

At the end of any boss level except for the final level, make sure you are Super Mario and jump onto the axe object at the end of the bridge at the same instance as also hitting the Koopa boss. You will flash as if you have been hit, but remain as Super Mario. In the next level, collecting a flower will make you smaller, however, you will still be able to throw fireballs. This cheat can also be achieved if you jump onto an already-released flower at the same moment as being hit by an enemy. You will have shrunk in size at the same time as receiving fire power, thus allowing you to throw fireballs while small.

Alternate Music

For alternate music in the boss levels, collect an invincibility star towards the end of the level before the boss level so that you are still invincible while passing through the flagpole at the end. In the boss level that follows, you will still be invincible at the beginning, but after the invincibilty runs out, the music will return to normal level music rather than boss level music.

100 Lives

At the end of World 1-3, you'll reach a pyramid with a koopa walking down at you. Carefully leap on the left side of its shell, pinning it. Do this again and again and each time you hit it, you will receive an extra life. But do not go over 100 lives.

Warp Zones

World 1-2: Towards the end of the underground section, jump onto the moving platform and jump right up to the top of the screen so you are standing on the brick ceiling. Keep running along the brick ceiling, past the pipe where you would normally exit. You will eventually come to a room with 3 pipes, allowing you to warp to World 2, 3 or 4.
World 1-2: Near the exit pipe at the end of the underground section in World 1-2, break the second to last and third to last blocks from the edge above the exit pipe, but not the one closest to the pipe (You will need to be Super Mario or Fire Mario to do this). Stand on top of the exit pipe entrance as far left as you can without falling off. Hold DOWN to crouch and keep this button held while you press A to jump and press RIGHT as Mario is about to reach the peak of his jump, making him brush his back against the first from last block remaining at the top, but not breaking it. Mario should then begin walking through the wall, accessing a warp area with 3 pipes. Normally, going down any of these pipes will take you to World -1, however, if done very quickly, you can warp to World 5 via the middle pipe. If this has worked, the words "Welcome to Warp Zone" and the number 5 will appear above this pipe upon entering.
World 4-2: At the first set of 2 platforms, you will see 3 blocks floating in the air to the right of these platforms. Stand directly under the space to the left of the first of these blocks and jump, revealing a block under that space. Stand directly under the second block and jump, revealing another block. Stand directly under the third block and jump again, revealing yet another block. Now, jump onto the third block that you just revealed, then jump to the second block that you just revealed. Move as close to the left as you can without falling off this block, then jump again. You will then hit the second block that already existed and a beanstalk will come out. Climb the beanstalk to find a warp zone, allowing you to warp to World 6, 7 or 8.
World 4-2: In the underground section, find your way up to the very top of the screen, like in World 1-2, so that you are standing on the ceiling bricks. Run along to the end of the level, past the pipe where you would normally exit and you should come to a warp zone, allowing you to warp to World 5.
World 5-1: When you get to the first pipe, walk back about 10 steps, then jump, revealing an invisible block. Jump onto this block, then hit the block on your right. A beanstalk should then appear. Climb the beanstalk to find a world full of coins with a warp zone at the end allowing you to warp to World 6, 7 or 8.

World -1

Near the exit pipe at the end of the underground section in World 1-2, break the second to last and third to last blocks from the edge above the exit pipe, but not the one closest to the pipe (You will need to be Super Mario or Fire Mario to do this). Stand on top of the exit pipe entrance as far left as you can without falling off. Hold DOWN to crouch and keep this button held while you press A to jump and press RIGHT as Mario is about to reach the peak of his jump, making him brush his back against the first from last block remaining at the top, but not breaking it. Mario should then begin walking through the wall, accessing a warp area with 3 pipes, taking you to World -1.

Jump over the flagpole

In World 3-3, jump onto the moveable platforms near the flagpole and wait until the closest one is at its highest point before jumping towards the flagpole. If you have enough height, you will jump over the flagpole and be able to continue running past the castle into a never-ending world.