World is Mine has a CPK! Remix version performed by Kaguya and Tsukimi Yachiyo for Chrono Kaguya-hime. The piano solo score for that version is an official intermediate-level arrangement, and the MSCZ file in circulation was prepared by TheOneHong.
A preview video is available if you want to hear the shape of the arrangement before practicing. The main challenge is control: small chord changes arrive constantly, so the sustain pedal needs to be changed often enough to keep the harmony from turning muddy.
Watch the rests in the tight ensemble figures. In places like the bar before rehearsal mark [E], the silences are part of the phrasing and should keep their full value. Chords in both hands should land together rather than spread out note by note. The piece also modulates, so read through the score carefully and mark the key changes before pushing the tempo.
The file is shared for study and reference, not for commercial use. It is available free through the QQ group 月读音乐小屋 (1055802853), or by contacting the person distributing it. If the arrangement is useful to you, support the official release where you can.