Hi, I am making a 2d platforming game and would like a level of it to be in the 3d space, I was wondering if it was possible to go from the 2d space into the 3d space and how. I hope I explained that well enough. :)
Yes, this is possible, you can use change_scene() from your 2D scene to your 3D one. There's no restriction that a project use only one type of node.
See here for more information about changing scenes: