Continue:

Hold A & Start on Title screen you loose all of your lives

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Minus World:

In World 1-2, stand on the pipe that takes you to the flag. Break the 2nd & 3rd blocks from the right. Face left and jump up. Hit the back of your head on the left side of the brick next to the pipe. If this is done just right, you'll be pulled through the wall. Jump into the pipe quickly. If you wait too long you'll go to World 4.

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Warps:

In Level 1-2, when you're at the end standing on the platform that goes up, jump on the top bricks instead of the ground that takes you to the pipe to the flag. You'll be able to go to either World 2, 3, or 4.

In Level 4-2, you'll come to some ? blocks. A set of three with a power-up in the center block. Accrossed from there are a set of 3 bricks suspended in mid-air. Below the far right brick jump up & you discover an invisible coin box, to the left of it, there's a second box that's a little higher, jump on the lowest box, & then the higher one. Jump & hit the brick that doesn't have a block below it. A vine will pop out & you can climb it. Up there, you can enter either 6, 7, or 8.

Also in Level 4-2, you can enter world 5. At the end of the level, you'll come to a giant pipe that's in your way. When you're on the very top of this pipe, break some blocks to make an opening so you can jump up.