*-. Where are we? .-*

This is a story where sonic and fnaf crossover.
Sonic and Tails really wanted to see their old friend in a different dimension. When Tails finished making his portal, they found themselves in a place they never seen before. Let's just say, not mobius.
They were in a huge glowing building and started to explore. Only one of few problems, sonic goes missing. Tails searches the building for help and ends up seeking a kind purple rabbit and orange bear to help him find his brother again and hopefully, get back home.