Indie developer FlatNine Games has announced that Letter Lost, a dark narrative-driven mystery adventure, will launch on Steam on June 10 for $19.99, with a 10% launch discount available at release. In Letter Lost, players awaken in an unusual setting: a cozy dungeon hidden beneath the post office on Kharnym Isle. Surrounded by cracked stone walls marked with mysterious scratches, players quickly discover that their new life revolves around a single responsibility—handling the island’s mail. As the sole employee of the Kharnym Isle Post Office, your daily duties include stamping, sorting, and delivering letters and packages to local residents. While…