Sonic Cookie (Korean: 소닉 쿠키, sonig kuki), or simply Sonic, is a Special Cookie released with Head tails.png Tails Cookie and Head moon rabbit.png Moon Rabbit Cookie in the second part of the Heart of Courage and Passion update (version 2.0.102). He is of the Ambushclass.webp Ambush type and his position is prioritized to the Middlepos.webp Middle. Sonic Cookie was added to the game as part of a special Devsisters x SEGA collaboration for Sonic the Hedgehog's 30th anniversary. He does not appear in the standard Cookie Gacha and could only be obtained via the crossover event. As the event has ended, he can no longer be obtained in-game.

Green hills, labyrinths of mystic caves, or risky loop-de-loops-nothing can stop Sonic, for he is the fastest hedgehog EVER! Amazing, huh? While Sonic might not care much about rules and all, he will stop at nothing to help a friend in need. Time to meet Sonic the Hedgehog, a hero running at super speeds to save the world! In his own way.

This stone holds an immense amount of energy inside. Simply holding it in your hands, you feel like running at super speeds!

Sonic Cookie and Tails Cookie are the first Special Cookies to be added to Cookie Run: Kingdom. Alongside Tails Cookie, Sonic Cookie is one of the first Cookies to be released with a full English voiceover. Sonic Cookie has no Korean audio and instead uses his English voice lines if the game is set to Korean audio. All of his lines appear to be recycled from previous Sonic the Hedgehog games and media. 감초's Korean voice actor, Um Sang-hyun, voices Sonic the Hedgehog in Korean localizations of Sonic X, the Sonic Boom TV series, and the 2020 Sonic the Hedgehog movie. However, he does not reprise this role in Cookie Run: Kingdom. Sonic Cookie's internal name is "cookie0525".