Sword of Malnok submitted a new map: Vs. Perfect Chaos - The final boss of Sonic Adventure comes to Halo 5 for the ultimate one-player battle experience. Read more about this map...
I'd just like to add that this fight is quite similar to the real Perfect Chaos fights, and so if you don't know what to do, check youtube for a walkthrough of the real fights (Sonic Generations' version of Perfect Chaos is probably better to watch).
I've heard that there have been some problems finding the game modes in my files, and when I looked into it, there seems to be something buggy between these modes and the content browser. If I create other modes, they appear in the browser, but even if I recreate these game modes they still won't appear. The game modes won't even appear in my bookmarks if I bookmark it. Yes, the search visibility is on, and I don't have any privacy settings blocking this. So for now, if you have this problem, try searching by the tag "Vs. Perfect Chaos" and if that doesn't work, message me and I'll invite you to a custom lobby where you should be able to pull the game modes from my files.