Two to four questions. No email, no account, the same deterministic routing the packs use on themselves.
It mirrors the packs' own entry logic, the same gates each pack's onboarding uses. Your answers route deterministically; there's no scoring trick and nothing to game.
No. Enter at your level, the finder routes you to the rung that fits where you are now. Every rung of the Run Series graduates into the next with a packet that pre-fills your next onboarding, so you never lose a step either way.
Take the lower rung. Each pack checks your readiness against its week one and builds the bridge if there's a gap, starting one step down is never a demotion, it's how the system is designed.