Privacy Policy

What we collect Nothing. We do not collect, transmit, sell or share any personal information. There are no accounts, no sign-in and no analytics. The only company that receives anything is our ad partner, Google AdMob — see Advertising below.

What is stored on your device So your progress survives closing the app, the game saves these on your phone only: • Your current puzzle and its state — numbers, notes, timer, mistakes and hints • Your statistics — games played and finished, best and average times, streaks • Your daily-challenge history and streak • Your settings — theme, appearance, mistake and notes options, haptics and the rewarded-ads preference • When an ad was last shown, so that ads stay infrequent This never leaves your device, and we cannot see it.

Internet access Puzzles are generated on your device, so you can play with no signal at all. The app uses the internet for one thing only: loading ads. Nothing about your puzzles, times or settings is ever uploaded.

Advertising The game is free and paid for by ads from Google AdMob. You will see three kinds: a banner on the Stats and Settings screens, a full-screen ad now and then after you finish a puzzle, and videos you choose to watch to earn extra hints. Ads never interrupt a puzzle you are solving. To choose and measure ads, Google AdMob receives your device's advertising ID, an approximate location worked out from your IP address, and basic device and app information. This goes to Google, not to us — we never see it. You are in control: Android Settings → Privacy → Ads lets you reset your advertising ID or turn off personalised ads, and turning off "Watch ads for hints" in the game stops reward videos being offered. How Google uses ad data

Children The game is suitable for all ages and is not directed at children under 13. We do not knowingly collect any information from children, and ads are served subject to Google’s own policies for family-friendly content.

Deleting your data Everything is under your control. Settings → Reset progress clears your saved games, statistics and streaks on this device, and uninstalling the app removes the rest. To clear what the ad network holds, reset your advertising ID in Android Settings → Privacy → Ads. We hold nothing about you, so there is nothing for us to export or delete on our side.