User blog comment:Blazing Flare/SEGA 3D Classics collection confirmed: Sonic 1 is listed in it!/@comment-3571790-20160122135738/@comment-4130826-20160127014031

If Scott never releases that DLC to open the chest, we'll never find the last Chaos Emerald. Thus, no evolution for Sonic.

I know this because Blaze is my wife.