The hope is that the predictions will be correct most of the time, allowing smooth play with minimal sudden changes to the game state. When other players’ inputs arrive, if any input didn't match the prediction, GGPO rolls back the state of the game to the last correct state, then replays all players’ revised inputs back until the current frame. Rather than waiting for input to be received from other players before simulating the next frame, GGPO predicts the inputs they will send and simulates the next frame without delay using that assumption. GGPO uses a netcode technique called " rollback". See also: Netcode § Input delay and rollback networking On OctoCannon announced on his Twitter account that GGPO was now open source and available under the MIT License. Games using it include Skullgirls and Street Fighter III: 3rd Strike Online Edition. Video game companies have also implemented a licensed version of GGPO. The downloadable GGPO client supported many games from Capcom and SNK, including Super Street Fighter II Turbo, The King of Fighters 2002, and Metal Slug X through the use of a built-in emulator. Cannon later demonstrated GGPO to Capcom, and it was positively received. As a reaction to its service, Cannon began development on GGPO and released the first version in late 2006. Before its creation, GGPO creator Tony Cannon was completely dissatisfied with the 2006 Xbox 360 re-release of Street Fighter II: Hyper Fighting after experiencing its criticized online capabilities.
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