1. first you will need mod tools so install that then install the 90G DLC for more assets. 2. Then load up mod tools and make a new map with this https://i.imgur.com/8M8Dgjk.png to make a new map then select zm mod level name it "zm_your map name here" the... 

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Collectibles Walkthrough For Call of Duty: Black Ops III Please Do Like And Favorite This Guide Please Do Subscribe To My YouTube: youtube.com/channel/UCIU3ln8qxqizOjp1iBSCOdg 

If you have issues starting the campaign by doing the proper steps (which is pressing 'select mission' then starting it). Then this small guide will help you fix it (worked for me so it should work for you) 

Полный гайд на карту Mob of the Dead (от copforthat), со всеми собираемыми предметами и улучшениями.