May 2, 2026
Rollback? More like clapback
A Physics Engine with Incremental Rollback for Multiplayer Games
Big game worlds are finally possible — and the comments are already spiraling
TLDR: Easel says it found a way to make much bigger online game worlds run smoothly by only rewinding the small parts that changed. Commenters were split between hype from devs calling it exciting next-level work and skepticism from people worried about platform lock-in and where games can actually be published.
A niche game-engine update somehow turned into a full-on comment-section soap opera. The big news: Easel says it can now handle much larger multiplayer game worlds because its new physics system only rewinds the parts of the game that actually changed, instead of rewinding everything every split second. In plain English, that means the dream of bigger online games — think running around a giant spaceship instead of a tiny room — suddenly looks way more realistic.
But the real heat came from the crowd. One longtime developer practically swooned, saying game development feels like entering “the big leagues” compared with building “yet another dashboard,” which is the kind of delicious workplace shade programmers absolutely live for. Another commenter took the idea way beyond games, imagining a wild future where your computer guesses what you meant, then rewinds when your slower voice command finally catches up — a very “my gadgets are arguing with each other” kind of vision.
And then, right on cue, the practical crowd kicked the door in: Is this open source? Can I host it myself? Am I getting locked into somebody else’s platform? Can I publish anywhere besides the Easel site? Suddenly the vibe shifted from “wow, cool tech” to “show me the escape hatch.” Even the article’s own joke, “Release the feral hogs!”, set the tone: this was not a calm engineering announcement. It was a nerdy breakthrough wrapped in meme energy, with fans cheering, skeptics squinting, and everyone smelling either a revolution or a trap.
Key Points
- •Easel replaced its previous off-the-shelf physics engine with a custom-built engine to better support predictive multiplayer rollback.
- •The new engine snapshots and rolls back only changed objects, rather than the entire world each frame.
- •The article says that in large worlds, fewer than 30 objects may change per frame, reducing snapshot work by about 30-50x.
- •Easel puts bodies to sleep immediately at near-zero velocity and tracks balanced versus unbalanced forces so settled stacks can remain asleep correctly.
- •Its broad phase uses a BVH with incremental rebalancing and collider-category tracking to reduce rollback overhead and speed up common game queries.