Practice Hub

Sharpen your
coding skills

Interactive fill-in-the-blank exercises across 10 languages. No account needed. Just practice.

1181+

Exercises

Languages

Difficulty Levels

∞

Practice Sessions

Choose your language

JavaScript

335 exercises available

The language of the web. Build interactive websites and applications.

BeginnerIntermediateAdvanced

Python

407 exercises available

Versatile and beginner-friendly. Great for AI, data science, and automation.

BeginnerIntermediateAdvanced

TypeScript

101 exercises available

JavaScript with types. Build scalable and maintainable applications.

BeginnerIntermediateAdvanced

Java

100 exercises available

Enterprise-grade language. Power Android apps and backend systems.

BeginnerIntermediateAdvanced

C#

33 exercises available

Microsoft's powerful language. Build games, desktop apps, and web services.

BeginnerIntermediateAdvanced

Go

38 exercises available

Simple and efficient. Build fast, reliable backend services.

BeginnerIntermediateAdvanced

Rust

25 exercises available

Safe and blazingly fast. Build systems and performance-critical applications.

BeginnerIntermediateAdvanced

SQL

110 exercises available

The standard language for relational database management systems.

BeginnerIntermediateAdvanced

HTML & CSS

12 exercises available

The foundation of the web. Structure content and style beautiful interfaces.

BeginnerIntermediateAdvanced

React

20 exercises available

The most popular frontend library. Build component-based user interfaces with ease.

BeginnerIntermediateAdvanced

How It Works

Three steps to
coding fluency.

Read the code

See real code with strategically placed blanks. Understand context before you answer.

Fill the blanks

Select from options to complete each blank. Get instant feedback on every choice.

Build fluency

Repetition makes syntax second nature. Track streaks and watch your skills grow.

Start now.

Pick any language above and begin your first exercise. No signup, no waiting.

Start with JavaScript

Sharpen yourcoding skills

Choose your language

JavaScript

Python

TypeScript

Java

C#

Go

Rust

SQL

HTML & CSS

React

Three steps tocoding fluency.

Read the code

Fill the blanks

Build fluency

Start now.

Sharpen your
coding skills

Three steps to
coding fluency.