Run a full ground-test campaign for Super Heavy on the orbital launch mount and Starship on its test stand: GO/NO-GO polls, propellant load and frost, engine chill, the water deluge, staggered Raptor startup, the burn, shutdown and detank.
Pick a profile, press Start, and use Hold, Abort or fault injection to see how the count responds. Drag anywhere to orbit the pad.
An illustrative simulation. Timings, thrust and flow figures are approximate.
This simulator needs WebGL. Open it in a current browser with hardware acceleration turned on.