GSB is a hosted backend platform for multiplayer games, offering essential infrastructure via a single API. It streamlines development, eliminating the need to build services from scratch. Features include matchmaking, global/regional leaderboards, player profiles, persistent state, server registry, in-game economy, and live-ops configuration for no-patch gameplay tuning. Supports anonymous, email, and Steam auth. Drop-in SDKs for Unity, Unreal, and Godot provide type-safe APIs.