Board Thread:General Discussion/@comment-26873653-20160723035910/@comment-5707987-20170325030002

Ogsonic wrote:

Would they technically be considered 26th anniversary games then.

If Sonic Mania is released on 23 June this year (which could be a possibility though the date is not announced yet), then it would be a 26th anniversary game (or could be considered if it was released close to that date like within a week before or after that date; just my opinion), even if it's not a special Sonic game released on every fifth-anniversary of the franchise.

For Sonic Forces, not at all since Late 2017 is too late to be considered an anniversary for Sonic.