A phone case just for Halloween?
It seems a little specific, but it is specifically-spooky! This art is all done in black, orange & grayish blue with under-lighting for a spooky effect. It has Sonic dressed as a vampire with 'bat type' cape, Tails as a furry 'monster' (look at his stuck-on eyebrows) & Knuckles is a fun pirate with jack o'lantern candy bucket. In the background Eggman is creeping along, Metal Sonic is lurking & a giant egg robo type robot is all the way in the background with "mad science" type devices all around. At the bottom is an open old-fashion coffin for Sonic to be springing out of. It's a complicated & shadowy design.
What's actually scary about the case is the price, it's 35 dollars in the SegaShop, and has arrived for Halloween 2018. (Really though, why a spooky phone case? Are seasonal phone cases 'a thing'?)