Hard data structure and algorithm practice puzzle.
Given four control points and t from 0 to 1, return the point on the Bezier curve at t, rounded to 4 decimals. Lerp each neighboring pair of points by t to get three points. Do it again to get two, and again to get one. That last point is on the curve. Every font letter and animation curve is drawn this way.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Frame Taxonomy Builder, a pipeline you can run and download. See every Software Engineer project.
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