In this three-part video series, Baris Tumerkan and Sezgi Ulucam collaborate to build a Unity leaderboard using Hasura. They learn about each other's expertise in GraphQL and Unity while working on the project. The team discovers how easy it is to set up queries, mutations, and subscriptions with the Unity GraphQL client by Tade Ajiboye. They also use Hasura Actions for customizing business logic for high scores. Along the way, they encounter bugs and solve them, making the process informative for viewers who may want to code along at home. The project includes setting up a Postgres database with Hasura, displaying top scores on the leaderboard UI, showing live scores using GraphQL subscriptions, and implementing business logic for high scores using Hasura Actions.