Black Ops 3 - Zombies Conversion Glitch Showcase (Maps in Customs, Easy Hero Gear & Bowie Knife)
Found this a while ago that leeches off of the "bot lobby" glitch, only this time you use a Zombies invite (or join off of someone in Zombies) to confuse the game into thinking you're in Zombies but are instead in Custom Games, leading to some interesting glitches (which as the title state, allow some unintended behavior that you can use to your advantage).
Some caveats: Bots don't work unfortunately, you can't edit gobblegums through this (meaning you can't get bugged items in there), and you can't alter game options. Furthermore, your loadouts don't appear either as they only load your empty loadout with whatever weapon the map gives you.
As shown in the video, this works on all platforms. I have not tried this with more than 4 people.
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At present, Remy has 149 views spread across 42 videos for Call of Duty: Black Ops III, and over 1 day worth of watchable video for Call of Duty: Black Ops III published on his channel. This is 41.94% of the total watchable video on Remy's YouTube channel.