osu! is a free and open-source rhythm game created by Dean Herbert (also known as Peppy or PPY). Originally released for Microsoft Windows, the game has also been ported to macOS and Windows Phone. Its gameplay is based on titles including Osu! Tatakae! Ouendan, Elite Beat Agents, Taiko no Tatsujin, Beatmania IIDX, O2Jam, and DJMax.
The primary emphasis of gameplay is to adapt and react to stimuli in the form of clicking or tapping on hit circles, which requires good eye–hand coordination. These hit circles have other forms, such as sliders and spinners which are interacted with in similar ways. Players can play osu! using various peripherals, such as computer mouse, graphic tablet, keyboard, and touchscreen device.
On the official website