A coding game for people who already code
Most coding games teach beginners with blocks and puzzles. DuelCoder is built for developers: you write real code in TypeScript, JavaScript, Python and C++, against a real opponent, on interview-grade problems.
What makes it a game
- A ranked ladder from Bronze to Grandmaster, with seasons and a season leaderboard.
- Placement: 5 rated duels confirm your rank, with an estimated tier shown along the way.
- Quill, a companion that hatches and grows from food you earn by playing and checking in each day.
- Friend challenges with a private code when you want to settle something with a colleague.
Modes
| Mode | What happens | Clock |
|---|---|---|
| Ranked Standard | 1v1 against a rival at your Skill Rating | 35 minutes |
| Ranked Speed | Faster 1v1 with its own rating | 15 minutes |
| Friend challenge | Private 1v1, unrated | 35 minutes |
| Practice | Solo, with sample tests and hints | None |
Is it for beginners?
If you can write loops, functions and use arrays and hash maps in one language, you are ready for practice mode, and matchmaking keeps your ranked opponents close to your level. If you are learning to program from scratch, start with a beginner course first and come back for your first duel.
Other coding games worth knowing
- CodinGame: puzzles, bot-programming contests and Clash of Code group races.
- Codewars: community kata that build language fluency.
- CodeCombat: a game for learning to code, popular in classrooms.
- Screeps: a strategy MMO you play by writing JavaScript.
- Battlesnake: program a snake to compete against other players' snakes.
Frequently asked questions
Are coding games good for getting better at programming?
Yes, when the game makes you write real code against real constraints. Timed duels on interview problems train recall of patterns, careful edge-case handling and speed.
Which languages does DuelCoder support?
TypeScript, JavaScript, Python and C++.
Is DuelCoder free?
Yes. Nothing you can buy changes matchmaking, judging or rating.