A guide to completing World 8-1 in Super Mario Bros 1 for the Nintendo Entertainment System.
Explore World 8-1
To the right, there is a Buzzy Beetle and six Goombas. You can kick the Buzzle Beetle shell through the Goombas, but the shell will bounce back when it hits the pipe to the right.
After the pipe, there are two Koopa Troopas, and some gaps you can automatically jump over if you run.
After the gaps, there is a Koopa Troopa, a coin in the air, three Goombas, and a pipe. After the pipe, there is a Buzzy Beetle, and if you collected all the coins in World 7-3 without dying, or if you warped to 8-1 via Warp Zone, you can stand in the middle of the area between the two pipes and go slightly to the right, then jump straight up to find a hidden 1UP mushroom.
Go past the pipe on the right, get the single coin in the air, go past one more pipe, and get the coin in the air after it. Before you continue, be aware that you can do down this pipe to get to a secret area, BUT if you do, you won't be able to get the two coins that you can see in the air to the right. It's possible to get those coins without going so far to the right that you make the pipe move off the screen. You can try that, or just ignore the coins and go to the secret area, or ignore the secret area, get the coins, and continue on. It's up to you. If you do go down the pipe, the rightmost brick of the long platform contains coins.
To the right, there are seven Koopa Troopas. After that, there is a pipe, three Goombas, and a pillar of blocks. Jump over the pillar of blocks, then if you go to the middle of the area between the two blocks and jump straight up, you will reveal a hidden block. If you jump on it, then jump straight up, the brick above you contains coins.
Go to the right, past another set of gaps that you can automatically jump over if you run (but this will be difficult because there are also Paratroopas there), there is a brick platform that hides a Starman in the third brick from the left.
Run to the right, over some gaps that you can automatically jump if you run, followed by two Koopa Troopas.
Jump over the short block pillar, then make a running jump over the big gap and try to get the two coins.
After that, there are two Goombas, then three pipes with gaps between them.
After the pipes, there is a Buzzy Beetle followed by 8 Goombas. If you kick the shell, be ready to jump when it bounces off the stairs on the right.
Then go to the right and go up those stairs. At the end, fall down to get the two coins, but beware of the Buzzy Beetle below.
Next, jump over two gaps, each of which has a coin over it.
Then there are two short block pillars with a Koopa Troopa between.
After that, there are two gaps, each with two coins over it. The platform between the gaps is small, so jump carefully.
Next, there is a Koopa Troopa, followed by three more Koopa Troopas. As usual, if you kick the first shell, don't let it hit you when it comes back.
After that, there are two pipes, and some stairs with gaps in between. Go to the top of the stairs and make a running jump off the top to reach the goal pole. You'll continue to World 8-2.