You can create custom games for Cogni-Crawl by uploading a regular folder with the correct JSON files contained within it.

Importing

You can either upload the folder into Cogni-Crawl by dragging and dropping the folder, or by entering the direct path to it.

Copy to AppData option

This simply is an option to disable copying the game to the app data folder of your operating system. It is recommended to keep this enabled, as if you don't copy your game to AppData, the game will depend on the exact location of the folder you uploaded, and that means if you change or delete the of the folder, the game will become unplayable.

Folder structure

The folder structure for the custom game should be as follows:

Game
|-- cards.json
|-- level.json 

Examples

I'm not going to go over all of the details behind the format of the JSON files, especially since this might be subject to change in the future, however, I have attachments for all the templates for all of the built-in flashcard games in Cogni-Crawl that you can use as a guide for building your own custom games