Well some of you might know OSU but if i ask my friends about OSU, they are like what the heck are you on about. I'm here to spread the news about osu.
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OSU was made in 2007 by a person who goes by peppy and he has made alot of progress over the past years. The game is basically hitting circles to the beat which sounds pretty simple. The main goal of this game is to some people is to get to #1 in the world and the way to do this is to earn PP. 
What is PP?
PP stands for performance point (not peppy penius). The way to earn PP is basically to do your best at any song or try and beat your personal record. The better you do and harder the song is, the more PP you will get. You can also use mods to increase your PP earnings but i will go over this in the next section.
What is MODS
Mods can make a song easier or harder.
Here a list of some mods and what they can do.
-Hardrock- this mod will make the circles smaller and in a more difficult place to hit.
-double time/nightcore- This mod will make the song much faster and nightcore basically make it sound squeaky and fast.
-perfect- 100% perfection or quit.
There are much more and they all do different things.
Modes
There are currently 4 modes, so if you find clicking circles is not for you, you can try these other modes that might be for you.
-Osu- already told you
-Osumania- keyboard style music game.
-osucatch- catching fruit to the beat.
-takio- drums style music game
Thats all for now, I will be posting more about this game (skins, creating songs/beatmaps and the new version of osu)