espee

Espee teaches you to solve coding problems by building solutions one block at a time. instead of staring at a blank editor, you pick the right code block at each step. wrong answers tell you exactly why they're wrong — not just that they're wrong. that's where the real learning happens. — 30 problems across C#, Python, and JavaScript — easy to medium difficulty — instant feedback on every answer — dark mode — no login, no account required, completely free built for developers who want to actually remember patterns, not just read solutions.