NN666Sync

Build timing and focus through a fully visual rhythm game designed to work offline. Follow original beat patterns and tap one of three marked lanes as each cue reaches the judge line. Sound is optional; every rhythm cue remains visible and identifiable without audio.

Explore 40 lessons across four chapters: Calm, Syncopation, Alternation and Compound. Lessons begin with steady single taps, then introduce neighboring lane changes, paired taps and short holds in stages. Each practice lasts 45 to 90 seconds and shows its actions, target accuracy and duration before play.

Tap along to five timing judgments, build a combo and keep playing after a miss. Pause whenever you need a break; resuming includes a visual three-beat countdown. An eight-flash calibration suggests a local timing offset, with manual adjustment and a default reset available in Preferences.

Review accuracy, judgment counts, lane-by-lane timing and your strongest combo after a lesson. Find a weaker 15-second section from the actual results and focus on that segment. Lesson progress, saved accuracy records, recent results and preferences stay on your device.

Adjust the experience with optional sound and haptics, a mirrored left-hand layout, reduced motion, a larger judge line and lane shape cues. No music library, account, network connection, leaderboard, advertising or purchases are needed.