A Sandbox version of the Foundry map "4 Levels," much larger and wider, remade for Halo: MCC. This map can be found on my fileshare, which you can view by using the "find player" option and searching for my gamertag.
I was planning to build a fifth level, but my progress was halted by the dreaded message "Could not create object. Too many on map." Also, I had to restrict the weapon placement on the map, but I placed as many as I could.
The map has been tested to see if anyone can get out of the boundaries. I have not found any path, but if you find something, please let me know.