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[Nolan Wilson]

The core mistake most homegrown rollback implementations make is treating it like a pure input-delay problem when it’s fundamentally a deterministic simulation problem. You need both players running identical, frame-locked game loops at the same tick rate (usually 60Hz, sometimes 120Hz for the render pipeline only) so that every simulation step produces byte-identical state. The rollback itself just layers on top: you predict the opponent’s inputs locally, advance the simulation, and whenever a delayed packet arrives, you rewind to that frame’s save state, reapply the corrected inputs, and re-simulate forward. GGPO popularized the “save state per frame” approach, but the real engineering weight is in your input prediction model. Fighting games are brutal here because you can’t just naively predict all inputs—you have to distinguish between a player holding forward (movement

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"Consistent frame times matter infinitely more than peak FPS."

[Nolan Wilson]

Solid topic. If you’re actually digging into how competitive titles protect themselves, the key thing most people get wrong is thinking it’s about encrypting the whole process — that’s a performance killer and pointless. What the big anti-cheat stacks (Vanguard, EAC, BattlEye) actually do is selective runtime decryption of hot code and data sections. The executable on disk stays obfuscated; the game decrypts only the critical routines (input handling, network serialization, aim/physics logic) into RAM right before execution, then re-scrambles them after. This defeats static analysis because the debugger sees ciphertext, and it defeats dumping tools because there’s nothing coherent to capture mid-run. The tradeoff is CPU overhead from repeated decrypt/verify cycles, so teams tune it to only protect the highest-value routines rather than blanket-encrypting everything.

On the obfuscation side, control-flow flattening and string/asset encryption are the workhorses, but the real architecture question is integrity verification and anti-dumping. You want checksums on decrypted sections computed at runtime and cross-checked against expected values, plus anti-debug primitives (IsDebuggerPresent, checking PEB debug flags, timing-based detection via RDTSC) to make step-through analysis painful. The catch for competitive play specifically is that kernel-mode drivers give the deepest visibility but also the highest risk of BSODs and false positives — one bad syscall handler and you’re blaming the anti-cheat for lag spikes.

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