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On the home screen, tap the small grey lock in the top corner. It asks a multiplication spelled out in words, such as "seven times eight"; type the answer (56) on the keypad. Inside you can turn sound, Zip's voice and haptics on or off, see the season table, save race videos, share tracks, use the grid editor, unlock everything or reset progress.
Open the grown-ups area. Under Tracks, every finished track has a film button: tap it to make a vertical race video. The first time, iOS asks to let the app add to Photos. Allow it and the video appears in your Photos library. The app can only add videos; it can never see your photos. If you said no by mistake, go to Settings, then Marble Race, then Photos, and choose "Add Photos Only".
In the grown-ups area, tap the share button next to a track (or, in My Tracks, tap a track's "..." button and choose "Share (grown-ups)"). It goes out as a file or a QR code through the share sheet. On the other device, open the file, or in My Tracks tap the add-from-code button and paste the code. Both ask the grown-ups check first. A shared track carries its race number, so your friend sees exactly the race you saw.
The app collects no data. Read the full privacy policy.