This Sonic Boom tee was seen in Sears in 2018.
It's all black, and has a bit of a 'portrait' theme. There's an arms-crossed Sonic face as the background shape...but it's filled in with CG art of the usual desert, along with Tails Knuckles & running-forward Sonic. There's a few bits of line here and there to help define it as a face but also a background. The Boom logo is off to one side. It's an interesting enough design even though the description is somewhat confusing.
This is in the boys/teens area, and should be about 9.99 if you can find it. It probably would have been a spring/summer offering, before too many Sears stores were forced to close. This may contribute to the shirt becoming rare.