How would I use the DataStore to communicate between two games? [Solved]

You can only have the DataStoreService communicate between places within the same game. Remember, each place is not "a game" - places are held within a game.

You would want to create a DataStore system in your game's start place, then have the other place access the same DataStore. I answered another question fairly similar to this one. So below I'm going to have a link to my previous answer, along with other resources that will fully help you reach your goal.

My previous answer to a similar question

The link to the answer above also contains more links to Wiki pages relevant to your question.

Hope this helps!