Pop'n Music 18: Sengoku Retsuden is a game in the Pop'n Music series of video games from Konami. This version is themed around the Warring States period in Japanese history.
Gameplay is identical to other games in the series. The Pop'n Music controller features 9 buttons organised in two rows. After you select a song, the screen will show 9 coloured "pop notes" descending towards the timing bar. You must watch the screen, and hit the corresponding coloured buttons in time with the music and the notes on the screen.