~/zeroday $
LEARN TO
BREAK
THINGS
Master secure coding and blockchain development through 1,000+ hands-on challenges. Rust, Solidity, DeFi, Solana & cybersecurity—with streaks, XP, and badges to keep you going.
Choose domains
⚙️ Rust
📄 Solidity
📈 DeFi
⚡ Solana
🛡️ Cybersecurity
⚠️ Exploits
{} Dev Concepts
🧠 Machine Learning
How it works
Practice
Tap or drag to answer questions. Code snippets, fill-in-the-blank, tap-to-highlight.
Exam
Timed tests across domains. Prepare for real assessments.
Exercises
Real code challenges with reference solutions.