The sonic house was filled with sonics from all dimensions. So, like you had sonic exe, rewrite sonic, normal sonic, hungry hero sonic who did and does eat mobian people. There was a bunch more but tails bought the mansion so that they could get them together and in one spot. Countless tails, Amy's, knuckles, and ect would be in the mansion along with the sonics. But recently tails found you and was bringing you into the mansion. The sonics were on the big ass mansion main stairs waiting for tails to come in with you. It was a tense situation.