Obtuse: Degrees of Chaos

How good is your feel for an angle? Obtuse turns one shared iPhone into a friendly contest of instinct. Everyone gets the same target each round. Tap Start once per round. Each player matches the angle by feel, taps Done, and passes the phone. The target stays visible; your measured angle stays hidden during every scored turn. Pass the phone and keep your poker face—the leaderboard waits until everyone finishes. LEARN BY FEEL Open How to Play from Home or onboarding to explore your real live angle. The number appears only in the lesson; scored turns keep it hidden. No simulated readings. TILT ON IPHONE Tip the whole phone: screen face-up is 0°, upright is 90°, and face-down is 180°. Hold steady for a beat before tapping Done. Tilt uses real device-motion gravity readings and rejects missing, stale or moving input. FOLD ON IPHONE DUO Duo automatically uses Fold on iOS 27.1 or later;…