Ninth Move
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Reach either gold exit on your opponent's edge, capture every opposing piece, or leave your opponent without a legal move.
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Every third capture restores one of your lost pieces near your home edge when an eligible space is available.
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Campaign positions 1–5 are free. Ninth Move Premium is a one-time purchase that unlocks positions 6–30. No subscription is required.
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Open any locked premium position, choose Restore Purchase, and use the same Apple Account that originally purchased Ninth Move Premium.
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Confirm that iCloud is enabled and that both devices use the same Apple Account. Initial synchronization can take a moment after opening the app.
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The Study Room stores completed games so you can replay moves, read Ninth notation, and explore alternatives from earlier positions.
Alpha Sierra Strike
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Tap directly on a falling bomb to intercept it before it hits your base! Your turrets can also shoot them down automatically. Intercepting bombs earns bonus points and is key to surviving higher sorties.
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The Air Strike button appears as a reward at sorties 10, 15, and 20. Tap it to call in a devastating strike that destroys every enemy aircraft on screen at once. You can earn up to two — save them for when the sky is full!
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Alpha Sierra Strike uses Apple Game Center for global leaderboards and achievements. Make sure you're signed into Game Center in your iOS Settings app. Your scores are automatically submitted after each game ends.
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Make sure you're connected to the internet and signed into Game Center (iOS Settings → Game Center). Scores can take a few minutes to appear globally. If the problem persists, contact us with your device model and iOS version.
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Keep defending past sortie 20 and stay sharp — something unusual has been spotted in restricted airspace. 👀
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Try force-closing the app and restarting. Make sure your iOS is up to date. If crashes continue, please send us a message with your device model and iOS version — we'll fix it fast.
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Yes — completely free to download and play. No ads, no forced purchases. Optional content upgrades may be added in future updates.
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We genuinely love hearing from players. Use our contact form. Screenshots or screen recordings are super helpful. Your feedback shapes every update!
Pro Tips
Intercept Bombs
Tap falling bombs directly — or let your turret shells take them out mid-air for bonus points.
Save Your Air Strike
Wait until the sky is packed before firing your Air Strike — maximum kills, maximum points.
Watch the Helicopter
Helicopters hover and fire bursts. Take them out fast — they get tougher every sortie.
Build Kill Streaks
Chaining kills without taking damage restores health at 25 kills. Stay aggressive!