Error search practice

💡 How to use?

Choose a programming language, topic and difficulty level
Click "Generate" — AI will create code with intentional errors
Read the code carefully and find all errors
Click on the lines where errors are
Click "Check" — see the correct answer and explanation

Programming language

Difficulty level

Topic

Code


                                            Click "Generate Code"

What is the error?

Click on the lines with errors

⚠️

Answer Expected

Progress

Easy
(0-49) Medium
(50-149) Advanced
(150-249) Master
(250-300)

0/300 solved
Level: Easy
Easy: 0 | Medium: 0 | Hard: 0

What is "Find the Error" and how does it help learning?

"Find the Error" is a unique programming trainer where artificial intelligence generates code with intentional errors. Your task is to find and mark all the lines with errors. This is one of the most effective ways to learn to read others' code, debug programs and develop code review skills.

🧠

Develops attention

You train to notice the smallest errors — from typos to logical bugs.

🔍

Code review skill

The ability to find errors in others' code is a key developer skill.

⚡

Instant feedback

You immediately see the correct solution and explanation of each error.

🎯

Python, JS, Java, C++, Go, Rust...

11 languages

📈

3 levels

Easy → Medium → Hard

🤖

AI generation

Each task is unique — AI creates different code each time

How to use the trainer?

Choose language and difficulty Click "New task" — AI will generate unique code with errors.

Analyze the code Carefully read each line. Look for syntax and logical errors.

Mark the lines Click on lines with errors — they get highlighted.

Check Click "Check" — you'll see correct lines and error explanations.

Progress Solve tasks daily — progress is saved automatically.

Frequently Asked Questions

Who is the "Find the Error" trainer for?+

For everyone learning programming — from students to experienced developers.

What programming languages are available?+

Python, JavaScript, Java, C++, C#, Go, Rust, PHP, Swift, Kotlin and TypeScript. 11 languages total.

Do tasks repeat?+

No. Each task is generated by AI in real time with unique code.

How is progress saved?+

Progress is saved automatically. You see statistics by difficulty levels.

Is it free?+

Yes, completely free. Create an account to save your progress.