Questions, bugs or ideas — write in English or Czech.
Email qubun@martasdx.cz. Including your iPhone model and iOS version saves a round trip. Replies usually come within 48 hours.
Three things decide a hit: how soon after it appears you tap, how close to the centre you land, and how long your current streak is. Missing a dot or tapping empty space costs you.
All three difficulties submit to the same leaderboard for a given session length, and your best score across them is the one that counts.
Best scores live on the device and are mirrored to iCloud. If you reinstalled or moved to a new iPhone, sign into the same iCloud account and open the app — they arrive on their own, usually within a few seconds.
Without iCloud there is no backup, and deleting the app removes them.
Game Center sign-in is deferred until you first open the global ranking, so the panel can look empty before you have signed in. Check Settings → Game Center on your iPhone.
Scores finished while offline are queued and submitted the next time you are signed in and connected.
Send what you did, what you expected and what happened instead, plus your iPhone model and iOS version. A screenshot or a screen recording helps more than anything else.