OSZ - Osu! Beatmap File
This is a file used by OSU! which is a rhythm game. Players synchronize mouse clicks on visual cues with music in order to play. OSZ files contains a ZIP compressed beatmap which includes graphics, a song and the click locations and timings for the clicks. Players can generate OSZ files to save and share custom beatmaps between players. They may be played by double-clicking the OSZ file in Windows or by using drag-and-drop to place the file in the OSU! game application window.