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Sharp is a free download. Your first day is free, then everything is free for 14 days more, and $2.99 a month keeps it after that. You can cancel any time in your App Store settings. Challenges and Lock apps stay free either way.

Open Settings in Sharp and tap Restore beside "Bought it already?". Make sure you're signed in with the same Apple Account you bought it with.

Yes. The purchase works with Family Sharing, so everyone in your family group can unlock it on their own devices.

Purchases go through Apple, so refunds do too. Request one at reportaproblem.apple.com.

Yes, with iCloud sync on (Settings › iCloud sync). Sign in to the same Apple Account on the new phone, open Sharp, and your games, levels and streak come across.

Rest days cover a missed day, and you earn one each week. Sharp uses them for you automatically.

Settings › Retake where you start resets where your games begin. Settings › Erase all data starts completely fresh, on this phone and in iCloud. Your purchase stays either way.

Settings › Export my data saves everything Sharp keeps, to share or keep wherever you like.

Pick the apps you lose time to in Settings › Lock apps until you play. They stay locked until today's games are played, or open 15 minutes at a time as you play. It uses Apple's Screen Time, and Sharp can't see which apps you picked.

Check that Screen Time is on in the iOS Settings app and that Sharp was allowed access. Then pick the apps again in Sharp.

In Sharp, open Settings › Lock apps until you play and remove the apps, or turn it off there.

Open Challenges, tap New challenge, pick a few games and play. Then send the link or code to your friend. They play the same puzzles and you both see who got more right. No account needed.

They'll need Sharp installed. If tapping the link doesn't work, copy the code from the message and paste it into Challenges › Got a code?.

Both phones need Sharp open on Play together, Wi-Fi and Bluetooth on, and Local Network access allowed for Sharp in the iOS Settings app.

Each game adapts as you play, aiming for you to get about 80% right. Give it a few rounds and it settles at your level.

Allow Microphone and Speech Recognition for Sharp in the iOS Settings app. Listening happens on your iPhone and nothing you say is kept.

Sharp is practice: you'll get better at these games. Whether that carries over to everyday memory or focus isn't settled by the research, so Sharp doesn't claim it. More on the science.