🔬 Pipeline Microscope · All levels · ~15 minutes
See Inside the Pipeline
A pipeline looks like one line, but every | is a decision point. Pick a pipeline, predict what comes out, then click each stage to see exactly what it kept, removed, and reshaped.
Simulated environment — fictional data, no real systems. The engine runs each stage for real against the sample dataset.
1. Pick a pipeline
2. Predict before you run
Commit to a prediction — that's what makes the reveal stick.
The variant changed the data. Fix the pipeline, then predict and run.
3. Inspect each stage
Click a stage to see what went in, what came out, and why.
4. Prediction vs. reality
Level up
Genie guide
Pick a pipeline, predict what it returns before you run it, then inspect every stage to see exactly what happened to each object.
A pipeline looks like one line, but every | is a decision point. Pick a pipeline, predict what comes out, then click each stage to see exactly what it kept, removed, and reshaped.
Reading 1 of 9 sections
Error decoder
Paste the red text. The decoder names the kind of error it is and points at the lesson that fixes it. It never runs your code, and decoding happens entirely in your browser — your pasted error is never sent anywhere.