SEGA's theme park resort, Joypolis was planning to do special event in Japan to do with halloween. The laws of the event is, that visitors of Joypolis have to see Sonic do halloween things. This is probanly unlike the Sonic Heroes (Japan 2003, rest of the world 2004) stages of Hang Castle and Mystic Mansion where there are lots of halloween things.
It feels halloween, with all of these ghosts
Ryan Drummond (voice for Sonic the Hedgehog (1998-2004)) playing that role in Sonic Heroes.
Sonic with Jack o' Lantern pumpkin