Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

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Generator & Parity-Check Matrix Sprint

Encode a message as x=uG, or compute a received vector's syndrome as xH^T -- both mod-2 matrix arithmetic, read off as one binary number.

⏱️ 120s

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