Both are at the bottom of the grown-ups area, and each asks you to confirm.
- Reset progress clears scores, history, badges and facts to practice. Names and settings stay.
- Erase everything removes names, settings and progress, and the app goes back to its first screen.
With iCloud on, both apply on every device using the same iCloud, the next time each is online. A purchase of Plus is never lost: tap Restore Purchase if needed.