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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

🕹️ Practice arcade

Extra games, not extra homework — timed sprints, survival runs that end when your lives run out, and mastery drills built from the same skills Optimization teaches.

Log in to play — the arcade tracks runs per student.

⚡ Sprints

Beat the clock.

⚡ Critical Points and Boundary Sprint

Find the critical point, then check the boundary -- as many extrema hunts as you can finish in ninety seconds.

🎯 Mastery

No clock — just get N in a row.

📉 Limits at Infinity Mastery

Same degree top and bottom — read the horizontal asymptote from the leading coefficients.