RollbackNet

RollbackNet delivers tournament-grade rollback networking. Built on the proven GGPO model, it keeps fast-paced peer-to-peer games responsive by predicting inputs and rolling back mispredictions invisibly.

RollbackNet implements the GGPO model: exchange inputs peer-to-peer, predict remote inputs to keep the game responsive, and roll back and re-simulate the handful of frames where prediction missed - invisibly to players. Session nodes cover local players, remote peers and spectators; sync-test mode deliberately rolls back every frame to expose determinism bugs while you develop; and network stats keep quality measurable.

This is the netcode fighting games, platform fighters and other twitch-precise genres demand. If your gameplay lives or dies on frame-perfect inputs - versus fighters, sports arcades, retro-style competitive games - rollback is the difference between 'plays fine locally' and 'plays fine online'.

RollbackNet is part of the Alpha XP networking collection for Unreal Engine 4.27-5.0+. Every feature is exposed to both Blueprints and C++, ships with styled HTML documentation, and follows one consistent API style across the whole collection. The plugin is compiled and verified against a clean UE 4.27 project, comes with a utility node pack (hashing, GUIDs, timestamps, tokens, validation), and is maintained under the Alpha XP brand with documentation hosted online.

Key Features:

• Rollback/prediction netcode core
• Deterministic session synchronization
• Spectator sessions
• Sync-test mode for desync hunting
• Network stats and endpoint helpers
• Utility node pack: CRC32/MD5/SHA-1 hashing, GUIDs, timestamps, random tokens and hostname validation

Full documentation: https://demo.alphaxp.net/FabStore/Network/RollbackNet/
Support: https://alphaxp.net/

Technical details:

Code Modules:

- RollbackNet (Runtime)

Number of Blueprints: 0
Number of C++ Classes: 6
Network Replicated: Yes

Supported Development Platforms:

• Windows: Yes
• Mac: No

Supported Target Build Platforms: Win64

Important/Additional Notes: Built for Unreal Engine 4.27-5.0+. Developed and maintained by Alpha XP.