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Each number is a run of filled squares in that row or column, in order, with at least one gap between runs. Fill squares you can prove, mark the ones that must be empty, and the picture appears. The first launch walks you through a short guided page, and you can replay it any time from Settings.

No. Every page, twist and boss plate is checked to be solvable one line at a time. If you feel stuck, look for a row or column where the clue only fits one way.

A wrong check costs a drop of ink. When the last drop is gone the run ends, but the plates you have won and the tools you have found stay in your collection.

No. Folio saves your run as you play, including a puzzle you were partway through. Tap Continue on the home screen to pick it up.

Folio has no accounts and stores progress only on your device. If you move to a new iPhone by restoring an iCloud or computer backup, your progress normally comes with it. Deleting the app deletes your progress.

Open Settings from the home screen and switch off Sound or Haptics. Folio also respects your iPhone's silent switch, and plays alongside your own music.

Yes. In Settings, tap Show tips again, and Pip will point things out as they come up.