Anniversaries/April 27
From Sonic Retro
April 27 (add)
- 2003 — "Chaos Emerald o Te ni Irero!", the 4th episode of Sonic X, airs in Japan.
- 2008 — GerbilSoft releases a prototype of Sonic's Edusoft, an edutainment game developed in 1991 by Tiertex. The original source is unfortunately lost in time.