Angle Duel support

Estimate angles by feel on an iPhone. Tilt a standard phone or fold an iPhone Duo, then let the timer capture your position.

Duel and Practice

Duel is for two players taking turns on one phone. Choose 1–10 rounds and 3–15 seconds per turn, then tap Begin Duel and Start. The same target is used for both players. Lower angle error wins the round. After capture, reset before passing: face up or face down on a standard phone, fully closed or open on Duo. Hold the endpoint briefly until the handoff appears.

Practice gives you one angle and five seconds. Review your measured angle and error, then try another.

Daily Five and Game Center

Daily Five uses five targets that refresh at UTC midnight, with five seconds per angle. Lower total error wins. Your first eligible start uses the local daily ranked allowance, even if abandoned. Further runs are practice. Interruptions or crossing UTC midnight invalidate ranking. Results and preferences are stored on this device; reinstalling can remove them.

Sign in to Apple Game Center for online scoring. Local modes work offline. If the leaderboard is unavailable, your result is kept locally; check Game Center settings and your internet connection. A developer service cannot restore local scores.

Sensors and requirements

Requires iOS 18 or later. Standard phones use motion: flat face up is 0°, vertical 90°, face down 180°. Either lifting direction works. Hinge play requires iPhone Duo with iOS 27.1 or later. Sensor readings must be available and fresh; a missing reading prevents capture. Return to the app and start again after an interruption. Check Motion permissions in iOS Settings if needed.

This is a game, not a precision measuring instrument. Keep a secure grip and do not force the hinge. Light/dark appearance can be changed using the sun/moon button on Home.

Contact

Email angleduel@studeny.top. Include your device model, iOS version, game mode, and reproduction steps. Please avoid unnecessary personal information. Do not send passwords or Game Center credentials.