Fix it First or Build it Better — race through 3 stations and finish before the clock runs out.
Two phases
Fix it First hands you a faulty system to probe and repair. Build it Better starts you from scratch.
3 stations, 1 clock
Triage, Circuit, and Pipe & Duct — one shared timer governs the whole run.
Time bonus
Finish with time left for bonus points multiplied by difficulty.
Cross-trade relay across triage, electrical, plumbing & HVAC.