Pick a code, inject Pauli errors on physical qubits, and watch which stabilizers fire. This is the syndrome extraction step every decoder in the suite consumes — made explicit, generator by generator.
01 Code & qubits
Click a physical qubit to cycle through no error → X → Z → Y → no error. Stabilizers whose support overlaps an anticommuting error will fire.
02 Syndrome
Inject an error, then press Decode to see the correction the syndrome implies.