Circle Lock

Rotate the rings. Line up the lock. Feel it click.

Circle Lock is a quiet, precision puzzle built around one simple motion: turning concentric rings until their notches line up. No timers shouting at you. No clutter. Just the board, your thumb, and the slow satisfaction of a lock falling into place.

It starts gentle — a ring or two, an obvious answer. Then the gaps tighten, the rings multiply, and every rotation asks for a little more patience and a little more precision. The kind of puzzle you pick up for a minute and keep coming back to for a week.

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WHAT'S INSIDE

Precision-touch rotation
Turn each ring with your finger and dial it in. Smooth, responsive, and exact — the game rewards a careful hand.

Tactile feedback
Haptic vibration on every turn, so the puzzle is felt as much as seen.

A quiet daily loop
Daily streaks, quests, and gentle reminders that invite you back without nagging. Play a round, keep your streak, come back tomorrow.

Modes, skins & events
Multiple level modes, unlockable skins, and rotating events keep the board fresh long after you've learned the basics.

Built to be picked up
Portrait, one-handed, offline. No account, no sign-in, nothing to connect.

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A NOTE ON THIS RELEASE

Circle Lock was built for Android and released on Google Play. It is preserved here as a final, free release — the same polished build, available to download and keep.

If you played it before: welcome back. If you're new: the door's open. Sideload it, enjoy it, and if it makes you smile, leave a comment.

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HOW TO INSTALL (Android)

1. Download the APK below.
2. On your device, allow installation from unknown sources.
3. Open the file and install.
4. Launch, and start turning.

That's it. No Play Store required.

Requires Android 7.0 (Nougat) or newer.

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WHY IT EXISTS

Senin Terus Studio builds small, focused games across many engines and genres. Circle Lock was one of our first Android experiments in turning a single, simple mechanic into something genuinely satisfying to hold.

It didn't need to be big. It needed to click. We think it does.

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Made with love in Kotlin by Senin Terus Studio.

Turn. Align. Unlock.