Well, sales wise it's kinda hard to pinpoint where this game will be since the last time Sonic saw a release outside of a Nintendo console was I think Sonic 4 Episode 2, which is now 5 years old. So if you only own an Xbox or Playstation console that's the last Sonic game you had the chance to buy. Sonic's gone down quality wise since then but the social media account is strong and Boom is a very mixed bag, so Sonic has a simultaneously better and worse reputation than in 2012. Another thing that throws in some complications though is that unlike the last console generation, there's no B version of this game (By that I mean things like Colors DS, Lost World 3DS, Generations 3DS, that stuff), which removes incentive to buy the game twice. Like I own Generations on PC and 3DS, but I'm not going to buy this for the PC and PS4 since that'd be pointless. So I'm personally not sure where this game will end up. I feel like they've been pushing for Mania though, and given it's positive reception I think it'll sell well. I'm surprised they didn't do a mobile version though, I'm sure most phones are capable of it and it'd probably would have sold a ton of copies like most of the mobile Sonic ports. I'm interested to see what they do with this game once Mania comes out, as they're definitely concentrating on that one more for obvious reason right now.