You'll never see it coming.
Special thanks to Matt, Toby, TheWay123, and Stride for playtesting, as well as TheWay123 for various suggestions.
Don't forget to check out rewardadrawer's Last Surprise chart too! : https://spinsha.re/song/906
UPDATE 2020/08/14: Nerfed the opening sequence. Thanks to TheWay123 for his suggestions of alternate patterns here, and a massive thanks to rewardadrawer for allowing me to use some of the patterns featured in their Last Surprise chart.
UPDATE 2020/09/19: Adjusted tempomap, and added a countdown to comply with tournament standards.