Run your code, forever
All 13 courses and 94 exercises are free to read right now, no account required — the one-time fee below is for actually running your solution against the real hidden test suite, on every exercise, for good.
$79 one-time
not a subscription — pay once, keep it forever
This price rises as the catalog grows — founding members keep today's price forever.
By purchasing you agree to the Terms. One-time purchase, all sales final — see the refund policy.
- Unlimited runs against the real hidden test suite, on every exercise, forever
- Every course's full catalog, current and future, is free to read regardless
- Real production code grounding, plus the research papers behind it
- Your submission history and the reference-solution editorial, unlocked
1 founding member already in.
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