One surprising element about Monument Valley 2 is that the entire environment is actually built from 3D assets. When viewed through the lens of parallel projection, however, the objects appear as 2D to the players.
In addition to this effect, custom-built extensions to the Unity Editor enabled ustwo to create architecture that looks connected through the game-view camera, though in reality it isn’t actually next to each other in world space.
Pieces of architecture sit far apart along the X axis, while lots of moving bits and bobs, including characters, move forward and backward on the Z axis without players ever realizing it.
Essentially, when characters arrive at the end of a path on geometry that sits farther back in world space – and that same path connects to another piece of geometry closer to the camera – the character teleports forward in world space to follow the path. Because players are viewing through the fixed orthogonal camera, however, they only ever see the character smoothly moving across a seemingly impossible environment.