9 dot captcha

A 9-dot captcha is a visual challenge used to verify that the user is human and not a computer program attempting to automate tasks or gain unauthorized access. The goal of the captcha is to prompt users to connect a series of nine dots using straight lines while adhering to specific rules. Here's an example of a 9-dot captcha challenge:

Instructions:

1. Connect all nine dots using four straight lines.

2. You must start and end each line on a dot.

3. Lines can't intersect or overlap.

Example layout:

```

• • •

• • •

• • •

```

Now, the user's task is to connect all nine dots using four straight lines without lifting the pen (or cursor) from the screen and without violating any of the specified rules. Here's one possible solution:

```

•--•--•

| |

• • •

```

In this example, the user has connected the dots with four straight lines, adhering to all the rules given. Captchas like this require creative thinking and "out-of-the-box" problem-solving skills, as the solution goes beyond the boundaries of the conventional 3x3 grid.

Remember, captchas like the 9-dot puzzle are designed to be challenging for automated bots while remaining solvable by humans with logical reasoning. The exact layout and difficulty of the 9-dot captcha may vary, but the core concept remains the same – connecting nine dots using a limited number of straight lines without violating any rules.