Name: Dr. Tim’s Time Machine
GT: A Squid Loaf
Description: An interactive puzzle map featuring time travel and the construction of a mysterious device.
Video: Dr. Tim`s Time Machine | Halo 5 Forge Maps - YouTube
Thanks to Unsorted Guy for featuring the map and taking the time to make the video.
If you need any hints or a walkthrough, check out the forgehub map post, it has a list with spoiler tags so you can just look at the section you need help with.