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Undo is always free, and so is starting the level over. When you need a push, Oakley's hint shows the next move, the drill bores a new hole on a bare spot and the mallet knocks any screw out. Each level allows only a few tools (fewer in the deeper realms, one in a Baron's Knot), and using one caps that level at two stars. Every level has been proven solvable within its par by a solver.

From level 16 on, each level has a clock. Starting a timed level uses a heart, and you get it back when you win. If time runs out you can add 30 seconds (with a short video or with nuts) or give up. Hearts refill one every 25 minutes up to five; gifts, Knots and the Market can take you past five. The clock pauses whenever a card, a lesson or a menu is open, or when you leave the app.

Each realm brings one new idea and teaches it once, in play. A millstone makes a plank heavy at one end. A rusted screw can't move until enough moves are made. A padlocked hole opens when the plank with its brass key falls. A painted hole takes only a screw of its color. A frozen hole thaws after enough planks fall. A cracked hole breaks once its screw leaves.

Open the Market (Shop on the home screen) and tap Restore purchases on the Offers tab, or use Settings › Restore purchases. Use the same Apple Account you bought with. The Quiet Workshop and the Master's Toolbox always come back; nut packs, the Apprentice's Kit and the Journeyman's Chest are used when bought and can't be restored.

Yes, if you turn on Settings › iCloud save (it's off until you do). Your progress, nuts, tools and hearts then follow you to your other devices signed in to the same Apple Account, and survive reinstalling the game. Purchases come back with Restore purchases.

Settings › Start over takes you back to the first page of the story, with the starting nuts, tools and hearts. Your purchases, ad removal and settings stay. With iCloud save on, every device follows.

Settings › Erase all game data deletes your journey, nuts, tools, hearts and settings on this device and in iCloud, on all your devices, and resets your Game Center achievements. Your purchases are kept by Apple and come back with Restore purchases.

Reminders are off until you turn them on: Settings › Reminders. The countdown after a win is Settings › Auto next level.

Refunds are handled by Apple. Visit reportaproblem.apple.com and sign in with your Apple Account.

In Europe, the UK and Switzerland: Settings › Privacy choices in the game. On any iPhone: Settings › Privacy & Security › Tracking. See our Privacy Policy.

It's rated 4+, with nothing unsuitable for any age, but it's made for teens and adults who enjoy logic puzzles, and the later realms get truly hard. Parents can use Apple's Screen Time and "Ask to Buy" to control purchases.