PartyNextDoor is launching a playable concert experience in “Fortnite” Friday, marking the latest musical artist to utilize the online gaming platform in an expansive way. Premiering Aug. 1 at 1 p.m.

The rapper’s estate has released three posthumous albums since his death, and another new track, “Empty Out Your Pockets,” will premiere at the Fortnite event. “I know he would be overjoyed to see how ...