If you've spent any time developing on the platform, you know that finding a solid roblox anti cheat script fly speed solution is basically a rite of passage for every creator trying to keep their game fair. It's one of those things you don't think about much when you're just building a cool map or scripting a neat weapon, but as soon as you open your game to the public, someone—without fail—is going to show up zipping across the map at Mach 5 or hovering over your obstacles like they're playing a different game entirely.
It's frustrating, right? You spend weeks balancing your gameplay, and then a kid with a free executor script ruins the experience for everyone else in the server. But here's the thing: while you can't ever "perfectly" stop every single exploiter, you can definitely make it so difficult for them that they eventually just give up and move on to a less protected game.
Why You Actually Need an Anti-Cheat
Let's be real for a second. If you're running a social hangout game, maybe a speed exploiter isn't the end of the world. But if you have a racing game, an obby, or a competitive shooter, having a reliable way to detect abnormal movement is non-negotiable.
Exploiters don't just "cheat"; they break the game's economy and its community. If legitimate players see someone flying to the end of a hard obby in two seconds, they aren't going to want to buy your gamepasses or spend time grinding. They're just going to leave. That's why getting your head around the logic of a movement anti-cheat is one of the best investments you can make for your project's longevity.
The Core Logic: How Most Speed and Fly Scripts Work
When we talk about a roblox anti cheat script fly speed setup, we're really looking at two main things: displacement and velocity. Most exploits work by either directly changing the WalkSpeed property of the Humanoid (which is surprisingly easy to catch) or by manipulating the character's CFrame to teleport them forward a tiny bit every frame.
The simplest way to catch this on the server is to look at where a player was half a second ago and where they are now. If the distance between those two points is way higher than what their WalkSpeed should allow, you've got yourself a cheater.
Checking Magnitude
The "Magnitude" property is your best friend here. In Roblox, Magnitude is basically just a way to measure the distance between two Vector3 points. On the server, you can run a loop that stores a player's position, waits a brief moment, and then checks their new position.
If you know your max walk speed is 16, and you check the position every 1 second, the player shouldn't be moving much more than 16-18 studs (allowing for a little bit of physics wiggle room). If they've moved 100 studs in a single second? Yeah, that's not "lag." That's a speed hack.
Dealing with Fly Hacks
Fly hacks are a bit trickier because players should be able to go up and down under certain conditions—like jumping, falling, or using a legitimate vehicle. However, most fly exploits work by freezing the Y-axis or applying a constant upward force.
A common way to detect this is to check if the player has been "falling" or "in the air" for an unrealistic amount of time without hitting the ground. If their state is Enum.HumanoidStateType.Freefall for ten seconds straight but their altitude isn't decreasing, they're probably flying.
The Problem with Lag (The "False Positive" Nightmare)
Here's where it gets annoying. You can't just write a script that kicks anyone moving too fast, because lag is real. We've all been in a game where our ping spikes to 500ms, and we suddenly "teleport" across the room. To the server, that looks like a speed hack.
If your anti-cheat is too aggressive, you'll end up kicking half your player base every time someone's microwave interferes with their Wi-Fi. This is why you need a "violation" system. Instead of an instant kick, you give the player "points."
- Moving a bit too fast? Add 1 violation point.
- Moving at light speed? Add 10 points.
- Once they hit 50 points, then you kick them or reset their character.
This gives the server time to realize, "Oh, wait, they weren't cheating; their internet just cut out for a second." It makes the whole system feel much more "human" and less like a mindless bot banning people for no reason.
Server-Side vs. Client-Side
I see a lot of new devs trying to put their anti-cheat inside a LocalScript. I'm going to stop you right there—don't do that. Well, you can, but it's mostly useless on its own. Since the exploiter has full control over their own client, they can just find your script and delete it.
Your roblox anti cheat script fly speed logic must live on the server (Script inside ServerScriptService). The server is the "source of truth." It doesn't matter what the client says; if the server sees the player's character 500 studs away from where they were a heartbeat ago, the server has the power to pull them back or boot them from the game.
That said, a client-side script can be a good "first line of defense." It can catch the lazy exploiters who just change their WalkSpeed property. But always back it up with a server-side check.
Advanced Techniques: Raycasting and Physics
If you want to get really fancy, you can start using Raycasting. You can fire a ray downwards from the player's feet to see how far they are from the floor. If they are consistently 50 studs in the air and aren't sitting in a plane or a helicopter, you can be pretty sure they're using a fly script.
Another thing to watch for is "Noclip." This usually goes hand-in-hand with fly scripts. Exploiters will turn off the collisions on their character parts so they can fly through walls. You can detect this by occasionally checking if the player's center position is inside a part that should be solid. It's a bit more intensive on the server's CPU, but for high-stakes games, it's worth considering.
How to Handle Punishment
When your script catches someone, you have a few options.
- The Rubberband: This is the most common. You just teleport the player back to their last "legal" position. It's annoying for the exploiter and doesn't hurt laggy players too much.
- The Kill: Just set their health to 0. It's a bit more aggressive and can be funny, but it doesn't stop them from just respawning and doing it again.
- The Kick: The classic. "You have been kicked for suspicious activity." It's effective, but again, be careful about those false positives.
- The Shadow Ban: This is the pro move. Don't kick them. Just make it so they can't interact with anything or make their speed 0. Let them think the game is broken. It takes them longer to realize they've been caught, which means it takes them longer to try and bypass your script.
The Constant Cat and Mouse Game
The truth is, no roblox anti cheat script fly speed is bulletproof. The people making these exploits are smart, and they're always looking for holes in the way Roblox handles physics. They might find a way to "spoof" their position or trick the server into thinking they're sitting in a seat when they aren't.
Don't let that discourage you. Your goal isn't to build an unhackable vault; it's to build a house with a really good security system. Most exploiters are "script kiddies"—they're just downloading a script they found on a forum. If your anti-cheat stops 95% of those people, your game is already in a much better spot than most.
Keep your code clean, test it with high-latency simulations (you can do this in the Roblox Studio settings!), and always listen to your community. If players are reporting a specific person is flying and your script didn't catch it, look at your logs and see why. Maybe your "violation" threshold is a bit too high, or maybe there's a specific vehicle in your game that's confusing the logic.
At the end of the day, making games on Roblox should be fun. Don't spend all your time worrying about cheaters, but definitely give yourself the peace of mind that comes with a solid movement check. Your legitimate players will thank you for it, and your game's reputation will be all the better for it. Stay consistent, keep learning, and happy scripting!