User blog comment:TheSuperKoopaBros11/Who would win in a race? Cirno or Sonic The Hedgehog?/@comment-4988763-20180923031407

If we're talking about base Sonic from the canon games, then possibly Cirno.

Sonic is consistently stated [http://to be faster than light to be faster than light], but Cirno is shown not only to be faster than light but she isn't exactly too far behind Moon Rabbits, beings who are stated to frequently travel interstellar distances on missions to Earth. Naturally, to be able to do so would require a much higher degree of speed than anything base Sonic from the canon games has ever shown so far.

However, Pre-Super Genesis Wave Archie Sonic did run across the multiverse twice in less than a day and game Super Sonic not only quickly traveled from the Earth to the Nonaggression Zone to fight Ultimate Emerl and outpaced stars while fighting Mother Wisp, but he also was capable of fighting both Time Eater and Solaris, both enemies that made time collapse and still were able to move in a spaceless and timeless void. These two versions would arguably win in a race against Cirno.