FAULTLINE

Five decisions. Three signals each. Learn to separate what happened, what you inferred, and what still needs proof. A playable diagnostic reliability drill.

Scenarios are educational composites based on Greasewire's published work; they are not live incidents or a claim of client delivery. All scoring is local. No telemetry, authentication, network calls, or paid task actions. Keyboard: 1–3 choose; Enter advances after feedback.