How do I merge images?

I built a 2D game with Construct 2 where you have to find your way through a labyrinth. I want to upload it

in the google play store, but have to implement some features which arent capable with construct 2. Therefor I made it with Unity. Nevertheless, everything works I only have to implement the Labyrinth itself. Thats the problem. Building the labyrinth again will take me a whole week and I dont have so much time. Is there a way to merge the images (which the labyrinth consists of) so that I can copy them into my Unity project, or do you have any other suggestions?

I don't understand.

Are you asking for help with a Unity project?

No. I only want to copy all images of an object at once and but them in a file, but they should still picture the level design. It doesnt depend on Unity. Forget what I wrote about Unity. I only want to know if there is a way to merge images or to copy them in a file as a whole.

P.S. My level design only consist of one object, the one which the images I want to copy are from.