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My Records (the trophy button on the Start screen) shows your personal bests stored locally on this iPhone, in a three-row layout by difficulty for the duration you pick. It doesn't require any sign-in.

Global Ranking (the button on the Results screen after a game) opens Apple's Game Center to show how your score ranks against players worldwide for the same session length. It requires an Apple ID signed into Game Center.

Yes, when you are signed into iCloud on both devices and use the same Apple ID. Qubun mirrors your player name, session preferences, haptics setting, and per-difficulty best scores to Apple's iCloud Key-Value Store. When you install the app on a new iPhone or after deleting and reinstalling, your data is pulled back from iCloud automatically — there is no "restore" button to press.

Your language choice (Settings → Qubun → Language) is intentionally not synced — it stays per-device.

If you are not signed into iCloud, the sync is silently skipped and the app works entirely from local storage.

At launch, the three Game Center leaderboards (30-sec, 1-min, 3-min) are intentionally held Inactive to monitor early submissions for score realism. They will flip Live shortly after the app gains traction. Your scores are still submitted and will appear once the leaderboards activate.

Qubun follows the Beat Saber rule — every screen tap is judged. Tapping outside any dot counts as a miss and breaks the streak. This rewards precision over button-mashing.

The streak badge shows your current consecutive-hit count, not the scoring multiplier. The colour bands tell you when you've crossed each tier (gray → cyan → green → yellow → orange → pink → red → purple → blue → gold → white at 100+). Showing the raw count keeps that visual feedback honest, instead of implying the number on the badge is the multiplier.

Internally there's a "speed level" 0–10 that drives how fast dots appear and how long they stay visible. Each hit chains your streak up; every 5 hits in a row bumps the level, and a miss drops it by one. The elapsed time of the session also contributes, gently on Low difficulty and fully on High, so even a player without a long streak feels the game accelerate as time passes.

Yes. Go to Settings → Qubun → Language and pick English or Czech. The change takes effect the next time the app launches. (This works on iOS 13 or later.)

Haptics fire on every dot hit, on streak milestones (every 5×), on misses, and on streak breaks (a double pulse). Toggle them on/off via the Haptics switch on the Start screen.

iOS 16 or later on iPhone XS / SE (3rd gen) or newer. Older devices (iPhone 8, SE 2nd gen) aren't supported because the neon glow effect doesn't hit 60 fps reliably on the A11 chip.

It opens this website. From here you can choose to support the developer via PayPal — entirely optional. Qubun is free with no ads and no in-app purchases; the donation is the only way to chip in if you want to.

Qubun does not collect or transmit any personal data. See the Privacy Policy for the full details, including the iCloud sync section.