The Dimension Bridge is the bridge that connects the fox dwelling of the Nameless Zone to the goblin-ruled Land Beyond. The connection is a frail wood bridge with weak rope acting as barriers on either edge. Underneath the bridge is a void, where anything that falls into ceases to exist. A spell once banned Land Beyond citizens from entering the Nameless Zone unless they could defeat that Zone's champion fighter. This was ended when the goblins took over the Nameless Zone.
Tails was once summoned to fight goblin Trogg before the latter could make his way to the Nameless Zone. The fox managed to win by sheer luck, with Trogg accidentally slicing the rope and cutting part of the bridge down, seemingly plummeting to his end. He actually survived and Tails, Morain, Knuckles the Echidna and Errol Blackthorn have all made the trip across to try and defeat Trogg. The bridge was last seen when Tails threw the orb containing The Dark One from the bridge, causing him to disappear and return the Enchanter Kings to their true selves.
Sonic the Comic Online
The bridge returned in Sonic the Comic Online but had changed significantly since Tails' first journey across. With the goblin presence in the Nameless Zone growing all the time, the bridge had become a trade route, allowing goblins to bring their wares in from their home. Some time later, a train bridge was somehow built alongside the bridge which would make transport between the Zones much less arduous. Morain objected to the goblin technology and, along with Pippa and Trent, attempted to destroy it. Tails was successful in stopping her plan.