Stopptanz plays a local music file or playlist and randomly stops playback to drive a stop-dance party game (Freeze Dance / Musical Chairs). It's a music/timer engine only — no player, chair, or score tracking. Features: - Freeze Dance mode: music stops at a random point, then auto-resumes after a fixed pause (host can also resume early) - Musical Chairs mode: music stops at a random point and stays stopped until the host resumes it manually - Configurable stop-interval range per mode - Playlist shuffle/loop - Seek/skip controls - System media notification controls No ads, no analytics, no tracking, no network access at all. Music files are read only from local storage locations you pick yourself.