GGPO is a rollback networking SDK that enables low-latency multiplayer gameplay by predicting player inputs and speculatively executing game state rather than adding artificial delay.
Traditional netcode introduces lag by delaying player inputs to account for network transmission time, creating a sluggish feel that differs from offline play. GGPO solves this by using input prediction and rollback: it sends inputs immediately to opponents, executes the game speculatively, and corrects state when actual inputs arrive. This approach preserves the timing, reactions, and muscle memory players develop offline, translating them directly to online play without the perception of network latency.
GGPO suits developers building competitive multiplayer games where input responsiveness is critical. The SDK is designed to integrate into both new and existing games. The project includes sample applications demonstrating integration, with Vector War provided as a reference implementation. Currently the tool builds only on Windows using Visual Studio 2019 and CMake, though porting efforts to other platforms are underway.
The project maintains active continuous integration on Windows builds. Development activity shows ongoing attention to the codebase with regular updates and maintenance of the build infrastructure.
