Anniversaries/June 23
From Sonic Retro
June 23 (add)
- 2001 — Sonic the Hedgehog 10th Anniversary, a CD, is released in Japan. Sonic Adventure 2 is released for the Sega Dreamcast in Japan and Europe.
- 2009 — Sonic Putter is released for i-mode 90x devices in Japan.
- 2011 — Sonic Bowling is released for i-mode 90x compatible phones through Sega's Puyo Puyo! Sega portal alongside Sonic Tennis DX for EZweb (BREW 3.1) compatible phones through Sega's Puyo Puyo! Sega portal and Sonic 20th Anniversary for iOS in Japan. Sonic & Sega All-Stars Racing is released for iOS in North America, Europe, and Australia while Sonic the Hedgehog Anniversary Bundle is released for the PlayStation 3 in Europe and Australia.
- 2016 — Mario & Sonic at the Rio 2016 Olympic Games is released for the Wii U in Japan, and for the Nintendo 3DS in Korea.
- 2017 — Sonic 25th Cafe Selection, a limited edition album, is released on CD in Japan.
- 2020 — Sonic the Hedgehog Volume 6: The Last Minute, a trade paperback, is released in North America.
- 2021 — The Sonic 30th Anniversary Symphony is streamed live on the official Sonic the Hedgehog YouTube and Twitch channels. Sonic the Hedgehog 30th Anniversary Celebration, a comic special, is released in North America.
- 2022 — Sonic Origins is released for the PlayStation 4, Xbox One, Nintendo Switch, PlayStation 5, Steam, and Epic Games Store worldwide.