osu! is a rhythm game where players use the mouse to click, drag, and spin according to the instructions in a song's beatmap.
Osu! is a rhythm game that is mostly community driven. It comes in four game modes featuring the standard game mode(osu) , Mania , Taiko and Catch the Beat.
The standard game mode is where the player have to control the cursor to the circles and tap accordingly to the timing of the beat.
The mania game mode is similar to stepmania , where the player have to press keys according to the beat and the keys.
Taiko game mode is where the player have to press the keys according to the beat when the circle approaches.
Catch the beat is a game mode where the player controls a character. The player must control the character to catch the falling fruits according to the beat.
You can also make beatmaps and skin-mods for the game too!