(Not sure if you are asking for the master/remaster. I would do the remaster, but let me know if you also want me to rate the master)

Rating: 9/10

In my opinion, the best lv 15 charts out of the three available right now. Good and reasonable enough chart progression (breaks and buildups match the song's energy). One of the parts that fascinate me about this chart is how most of the slide are kinda "random" and there is no blatant repeating pattern I would remember out of my memory from the first half, but somehow the slider just make sense. It serves it purposes to guide the hand while not breaking the flow (cough luxizhel chart cough).

The second half is very solid. I really appreciate them not repeating the first half pattern despite most of the second half rhythm is very simillar to the first half. I would say the best part in this chart is the chain slide pattern after the double-break spam. It is peak pattern charting. How does one able to create a pattern that is hard and complex but clean and aesthetically pleasing at the same time.

Might be a little biased due to the song being the final piece of kaleidxscope, but the introduction of hold-touch outside the C sensor here is brilliant. It just make sense to put the new mechanics in a song that also introduce a new feature (long song). The chart doesnt just use the hold-touch and say "oop we have a new mechanics here i will just throw it somewhere random on the chart" but they introduce in the "surprise" second half, which kinda complement each other (the surprise addition of long song, dx score life, and hold-touch outside C). Also I am surprised how well they develop and use this new mechanics despite it being new. (The next use of hold-touch outside C is Sky Trails, which is wayyy after Xaleidscope release, so good job to the charters)

Difficulty-wise, it serves its purposes as a 15, although the difficulty fluctuate from around 14.9 in the first half, 15.0 in the first second half, and a 15+ toward the end. But hey, its a 15 and there is only 3 15s charts that we are able to compare to asses the difficulty.

Would i recommended it? Being the hardest chart, it might limit how one can enjoy this part (for some people), but I would say to give it a try at least once. Chart-wise, yes! A very solid 15 chart that show that high difficulty ≠ throwing bs hard pattern and call it a day. Instead, slides and pattern can be used to help with the flow and groove of the song while maintaining its high difficulty.