Reading from a Leaderboard
The Read Leaderboard Integer node will request from the platform's game service (currently iOS Game Center, or Google Play Services), the value stored on the given Stat Name for the provided Player Controller.
Note that it is a latent node, and thusly has a number of execution output pins. The top most is a "pass through," that works like any other execution output pin. The other two pins (On Success, and On Failure) will execute when the online service returns (or fails to return) a value. The value of Leaderboard Value before a successful return (or if the service fails to get a response) will be
The example below is from the Global Game Instance Blueprint in the Unreal Match 3 sample game. In these few nodes we're calling the Read Leaderboard Integer node for the Player Controller at Player Index 0 on the Stat Name (Leaderboard) "Match3HighScore":