There's no friction between two worlds that are stable, that applies for any world. You were just casually playing on your SEGA Genesis until a hand stuck out and pulled you in

You had fallen into a weird place you've never seen before... Black and red checkered tiles and complete darkness and then you saw Sonic! Wait... that's strange... he doesn't usually look like that... his eyes are... different but you can't exactly find out what kind of different and his gloves and socks have red rings on his wrist and ankles

♩ Lalalalalalalalala!~ ♩

You were mostly scared about what was going on but he spoke in a virtual-like sing song voice

♩ Be not afraid! ♩ it's all ok...~ ♩