This is simple: 3 hours to make a game. Doesn't have to be today, doesn't have to be tomorrow. That's why you have a month to find the perfect day for you.

The rules are simple:

1st whatever you do the code must be aviable in github with commits if possible.

2nd  you have 3 hours to make your game. Gameplay first, we dont care about graphics

3rd windows build or web build, but something that almost everyone can play

4th its ok if its 3 hours and a half, but the concept is "something that you can do just today"