# How does one mod drop lists and map locations?

**URL:** <https://discourse.cataclysmdda.org/t/how-does-one-mod-drop-lists-and-map-locations/14663>\
**Category:** The Toolbox\
**Created:** [December 16, 2017, 2:32am UTC](https://discourse.cataclysmdda.org/t/how-does-one-mod-drop-lists-and-map-locations/14663 "2017-12-16T02:32:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ShadowDragon8685](https://avatars.discourse-cdn.com/v4/letter/s/c68b51/32.png) [@ShadowDragon8685](https://discourse.cataclysmdda.org/u/ShadowDragon8685)\
**Post date:** [December 16, 2017, 2:32am UTC](https://discourse.cataclysmdda.org/t/how-does-one-mod-drop-lists-and-map-locations/14663/1 "2017-12-16T02:32:07Z")

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This question is going to sound a little stupid, I know; how does one go about creating and adding locations to CDDA? Is there a simpler method than ASCII mapping in a text editor?

And how does loot happen? Say, for example, I made some new book items, how would I go about making those spawn in libraries and such?

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**Author:** ![Aggregate](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/aggregate/32/1484_2.png) [@Aggregate](https://discourse.cataclysmdda.org/u/Aggregate)\
**Post date:** [December 16, 2017, 2:47am UTC](https://discourse.cataclysmdda.org/t/how-does-one-mod-drop-lists-and-map-locations/14663/2 "2017-12-16T02:47:04Z")

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To your second question: the “item\_groups.json” file and the contents of the “itemgroups” folder are what you’re after.  
To the first: some digging tells me that there used to be a program made for making/modifying maps, but it no longer seems to work. So you’re stuck with text editors.