To beat Super Mario Bros. Level 1-1, follow these detailed steps:

### Step 1: Initial Setup
1. **Start the Game**: Begin the game by selecting Mario or Luigi and starting the first level, World 1-1.
2. **Initial Path**: Run to the right of the screen. You will encounter a Little Goomba; jump over it to avoid taking damage.

### Step 2: Collecting Power-Ups
1. **Question Mark Blocks**: As you move right, you will encounter question mark blocks. Jump on them to reveal coins or power-ups.
– **Coin Block**: Collecting coins will give you extra points and help you progress.
– **Magic Mushroom**: If you hit a question mark block that contains a mushroom, Mario will grow bigger and become invincible for a short time.

### Step 3: Navigating Obstacles
1. **Pipes and Hidden Areas**:
– **First Set of Pipes**: After the initial path, you will see three pipes. The first pipe leads to a secret area with 19 coins. You can enter this area to bypass much of the level and exit near the end.
– **Hidden 1-Up Mushroom**: If you don’t take the secret area, you will find a hidden 1-up mushroom block after the set of pipes. Jump on it to get an extra life.

2. **Bricks and Coins**:
– **Coin Brick**: There is a brick down below containing ten coins. Jump repeatedly underneath the brick to retrieve the coins.
– **Starman**: There is a brick containing a Starman. Collecting it makes Mario invincible for a short time.

3. **Enemies and Obstacles**:
– **Little Goombas**: These enemies will fall from above. Jump over them to avoid taking damage.
– **Koopa Troopa**: A Koopa Troopa will appear later in the level. You can jump on it to defeat it.

### Step 4: Final Section
1. **Pyramid-Like Blocks**:
– **Hard Blocks**: After the second set of bricks, you will encounter a pyramid-like set of hard blocks with a gap in the middle. Jump over the gap to avoid falling into a pit.

2. **Final Stretch**:
– **Ending Staircase**: The final section of the level includes a staircase leading to the flagpole. Jump from the staircase to land on the flagpole, completing the level.

### Summary
– Run to the right, avoiding enemies and collecting power-ups.
– Use pipes strategically to find hidden areas and extra lives.
– Navigate through bricks and coins carefully.
– Avoid falling into pits and defeat enemies by jumping on them.
– Finally, jump from the staircase to land on the flagpole and complete the level.