The Arch is a location in LEGO Dimensions which contains every Adventure World portal for Year 3 of RealGameTime's customs. It is accessible by the use of an Aerial Faith Plate on the Nintendo Switch, Xbox One, and PlayStation 4 versions or its own Portal on the Xbox 360, PlayStation 3, and Wii U versions. It was originally just a piece of the background, but has been revealed that it was always planned to be accessible.
- Jumanji: Welcome to the Jungle World
- Stranger Things World
- The Angry Birds Movie World
- Looney Tunes World
- Labyrinth World
- Foundation Prime
- Unikitty! World
- Ben 10 World
- Willy Wonka and the Chocolate Factory World
- Ferris Bueller's Day Off World
- Prior to its announcement, the Arch was a floating ruin in pieces. In Year 3, the Arch is now complete.
- True to its name, the Arch contains a arch-like structure.
- Just as the Toy Tags are a pink color, the light around the \Arch is the same color.
- In the Xbox 360, PlayStation 3 and Wii U editions of LEGO Dimensions, the Arch is loaded separately from The Shard, and therefore, has its own gateway next to the Shard portal gateway in the The Shard area of the Vorton hub.