OSU! is an open source music rhythm game developed by Dean Herbert at 2007. The game consists of four game modes: osu!standard, a circle clicking simulator; osu!taiko, a drumming emulator; osu!catch, a fruit salad catcher; and osu!mania, a key smashing synthesizer. For more info, you can visit: osu.ppy.sh
I heard that OSU! has become more and more popular.
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