4th dan to 6th dan 4k courses completed in just 30 minutes
https://osu.ppy.sh/ss/8930624 - 4th dan
https://osu.ppy.sh/ss/8930620 - 5th dan
https://osu.ppy.sh/ss/8930610 - 6th dan
https://osu.ppy.sh/ss/8930624 - 4th dan
https://osu.ppy.sh/ss/8930620 - 5th dan
https://osu.ppy.sh/ss/8930610 - 6th dan