the theme is open world 

you can make a puzzle game

rules

1.no inappropriate content or raciest content 

2.you can use premade assets but none from unity 

3.do not hate on other peoples content

4.and no profanity

5.and you can use a game that your working on or a game that you made in the past (idk why u would do that)

6. you can only use unity or unreal engine

7.and it has to be playable on pc 

8.and just have fun