1st: Go to "Community & Creative Maker".


2nd: You see in the first place bunch of mini games made by creator, then head to game source and click "My Creations".


3rd: Click the plus button to make one


4th: In the right menu, you can choose the game you want to create for which version. It will be available for all version of the game if you made purchase for DLC(s).


5th: You can set the color line, fill, and etc., then you can set which items to find in your game (one is enough to publish).


6th: If you have finished, save your work. Fill the name and description of the item.


7th: Before you can share your item to Steam Workshop, you have to play it first.


8th: And there you have it. When you click share button after playing your own game, then you can see that your item is listed in Steam Workshop.


9th: Here is the examples of the mini game I made:
Alone :: I'm alone. But feel confortable in loneliness
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3450147646
Find All Gathered Cats :: Find all only cats gathered in a beach...
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3450145856