Fill in what you know below, then press Score. Missing or unrecognized fields aren't penalized directly. The score uses whatever information remains, so it can shift, and confidence drops. State is the exception: a blank state means "no state on file", which is itself a signal and clearly moves the score.
250 example leads.
Extra columns are ignored. Missing ones lower confidence, not the score.
Live Lead records from your connected org, scored the same way. See /salesforce/leads for the raw JSON.
Columns it reads, in any case or spacing: channel, icp_category, company_annual_revenue, utm_medium, legacy_score, state, time_zone, plus an optional lead_id.