Medium data structure and algorithm practice puzzle.
Given a 2 by 2 grid of texture values and a point (u, v), each from 0 to 1, return the blended value, rounded to 4 decimals. Blend the top two values by u, blend the bottom two by u, then blend those two results by v. Three lerps. Your graphics card does this billions of times a second.
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 Tile Exporter, a pipeline you can run and download. See every Software Engineer project.
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