Yo. I converted the hardest and most popular dan courses in osu!mania.
It was one of the worst ideas I have ever had. Some of these dans (in osu) are extremely off-sync, outside of the snap grid, and even with the wrong bpm. Converting some of these basically consisted in wiping everything, doing the timing from scratch in AV and going out of my way to find the origin of the charts used just to copy paste them over my timing.
Special mention goes to wonder for making the ‘‘TR1PLE DAN’’ courses. They are by far the worst ones. Go check them out in the osu editor to see what I mean 
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Big thanks to loafusofbread for suggesting which dans to convert and to Emik for helping out.
Also please delete the old conversions pack from the site, thanks.
CHART LIST:
10th Dan v2
Luminal v2
Tachyon v3
[Dan ~ REFORM ~] ~ EXTRA-ALPHA ~
[Dan ~ REFORM ~] ~ EXTRA-BETA ~
[Dan ~ REFORM ~] ~ EXTRA-GAMMA ~
[Dan ~ REFORM ~] ~ EXTRA-DELTA ~
[Dan ~ REFORM ~] ~ EXTRA-EPSILON ~
[Dan ~ REFORM ~ SAMPLE] ~ EXTRA-ZETA ~
[TR1PLE DAN] Stage ~ ALPHA ~
[TR1PLE DAN] Stage ~ BETA ~
[TR1PLE DAN] Stage ~ GAMMA ~
[TR1PLE DAN] Stage ~ DELTA ~
[Cyclone of Jack Ver.3] Phi
[Cyclone of Jack Ver.3] Chi
[Cyclone of Jack Ver.3] Psi
[Cyclone of Jack Ver.3] Omega
[Cyclone of Jack Ver.2] Jack 3
[Cyclone of Jack Ver.2] Jack 4
[Cyclone of Jack Ver.2] Jack 5
[Cyclone of Jack Ver.2] Jack 6
[Cyclone of Jack Ver.2] Jack Final