It's rather obvious that the guy doing it is well experienced to be able to complete that song..I've seen good players who can't clear the entire song.
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For some reason I can't play Osu! now.
I can't really explain it, but when I try to play, my mouse is kind of slow, even when I'm moving it fast enough, it will sometimes lag.
I tried playing with the sensitivity settings, but it just won't work.
Maybe it needs new batteries or something? I don't know.
I should note that Windows 8.1 may cause problems when using a mouse in "osu!". Especially when you toggle with the mouse sensitivity on "osu!".
Halozy's Dut Usagi Tobi Suteppu on lunatic is a fun map to play on.
Gotta love Touhou Osu! Maps.