Sharpen Python.
Take the offer.
1339 problems — from the basics to real tech-interview questions. Solve under the clock in interview mode and climb the ranks.
This is the Code Beast. Every player gets their own — and it evolves with every new rank.
questions from real interviews
- Meta
- Amazon
- Microsoft
- Tesla
- Spotify
From task to verdict in 3 minutes
No onboarding. Open it, write it, see where you blew it — back into the ring.
Pick a task
Topic, level, company — filters in one click.
Write Python
Write your solution in the browser on Python 3.12. Monaco editor with syntax highlighting and autocomplete.
Get the verdict
Diff against canonical. AI pinpoints the mistake.
No second chances in a real interview. Here, take as many as you need.
Timer runs on the server, browser is locked, no hints.
Eight ranks, Junior to Titan.
Hit Senior and interviews stop scaring you.
Every solve earns power. Streaks, achievements, weekly leaderboard. Your closest rivals are always in sight.
Harder task × first try × interview mode = faster rank. Premium solves grant ×1.5 Power — the boost is permanent.
- EASY · 10 power
- MEDIUM · 25 power
- HARD · 50 power
- EXPERT · 75 power
Free — forever. Premium — when you want more.
No auto-charges: pay for a period, train. The longer the period, the cheaper each month.
- Every Easy-level task — interview easies included
- Your own 3D code beast from the very first task
- Sandbox with instant grading
- Leaderboard, streaks and achievements
- All Medium, Hard and Expert tasks — interview questions included
- Unlimited AI mentor and problem generation
- Unlimited Interview mode and certificates
- +50% Power for every solve — permanently
The short version
Is it free?
Yes. Every Easy-level task — including easy questions from real interviews — plus ranks, your beast and the leaderboard: free forever, no card. Premium unlocks the harder tiers (Medium, Hard, Expert), unlimited AI mentor and interview mode.
What Python version is used?
Your code runs in an isolated Python 3.12 environment and is graded instantly against hidden tests.
Is it good for interview preparation?
Yes. There's an Interview mode with a timer and focus tracking — like a real tech screen — plus problems from Google, Meta, Microsoft, Tesla and other companies' interviews.
Is there an AI helper?
Yes. The AI mentor reviews your code, explains your mistakes and points you in the right direction — right on the task page.
Do I need a card? Is there auto-renewal?
Free needs no card at all. Premium is a one-time payment per period (from $4.7/mo) — no auto-renewal, nothing charged behind your back.
The axe is in your hand. Swing.
Two minutes to your first task. One month to the offer. Your move.
Claim your rankBack to training