I'm not positive but I think that house was on the lot of Universal Studios and it was never a real house.
Yes it does exist, it came out in 1992, its an old sonic game, its 2d. You can play as Sonic, and Tails following you around.
No Mobius does not exist and Sonic is from fantasy Earth in the main-canon of the games made by Sonic Team.
An universal solvent doesn't exist.
Sonic battle online doesn't exist.
Sonic Heroes 2 does not exist.
She doesn't exist until Sonic Advance 2.
Sonic riders, Sonic Riders: Zero Gravity and Sonic Free Riders already exist.
An universal solvent doesn't exist.
Shadow don't exist in sonic advance's series
No. It does`nt.
Sadly, yes. :(