Hello Developers!
Introduction
What are we talking about today?
Today I’d like to introduce to you my Anti-WalkSpeed detection system which also punishes players by kicking them but anyways you are going to be allowed to change my code and use it for free as it is an open-source as well in which everyone can contribute at it at GitHub. I also designed an automatic detection of calling your default game walk speed by checking the server-sided walk speed and not client one, so basically everything you have to do is just paste the script in ServerScriptService and I am completely serious about it. 
Functionality
How does this anti-exploit even work?
I am going to start with an idea about which values this anti-exploit creates. It creates three values, first one is to determine which player we are checking in-game, second is int value which determines how much time passed since the last update of third value which determines how many times this anti-exploit caught player exploiting. Of course, I added a reset in the script so that’s why I added those two values as well. Now let’s go on the basic anti-exploit system which is constantly every second detecting local player’s position and it calculates the magnitude out of it. We know that default walk speed determines how many studs player creates by max. For example: 16 is set as default walk speed and that means that player can maximum creates 16 studs every second. Then when we have magnitude calculated we compare it with the local player’s walk speed from the server-side of course. At the same time, we check if the player is touching the ground and not the air so we get rid of Roblox’s bounces which are pretty popular nowadays. If the player passes all of those values then anti-exploit adds a (+1) value to caught value, the max value of those is 3 by default in the script which you can change it on your own.
Documentation and source code
local MaxCaughts = 3 -- This is max value of how many times anti-exploit can detect player exploiting.
local MaxSinceLastCaughtChange = 10 -- This is max time for how long 'caughts' value wasn't changed.
--IMPORTANT: You can leave everything by default this Anti-Exploit is going to automatically detect what is your game's default WalkSpeed by reading the walk speed from server-side.
-- _ _ _ _ _ __ __ _ _ _____ _
-- /\ | | (_) ( ) /\ | | (_) \ \ / / | | | / ____| | |
-- / \ _ __| |_ _ ___|/ ___ / \ _ __ | |_ _ _____\ \ /\ / /_ _| | | _| (___ _ __ ___ ___ __| |
-- / /\ \ | '__| __| |/ __| / __| / /\ \ | '_ \| __| |______\ \/ \/ / _` | | |/ /\___ \| '_ \ / _ \/ _ \/ _` |
-- / ____ \| | | |_| | (__ \__ \ / ____ \| | | | |_| | \ /\ / (_| | | < ____) | |_) | __/ __/ (_| |
--/_/ \_\_| \__|_|\___| |___/ /_/ \_\_| |_|\__|_| \/ \/ \__,_|_|_|\_\_____/| .__/ \___|\___|\__,_|
-- | |
-- |_|
game:GetService("Players").PlayerAdded:Connect(function(plr)
local PlayerName = Instance.new("StringValue") -- Just a value to determine localplayer name
PlayerName.Parent = script
PlayerName.Name = plr.Name
local SinceLastChange = Instance.new("IntValue")
SinceLastChange.Parent = PlayerName
SinceLastChange.Name = "SinceLastChange"
local counter = Instance.new("IntValue") -- Anti-Exploit detection caughts
counter.Parent = PlayerName
counter.Name = "Counter"
plr.CharacterAdded:Connect(function(char)
while true do
SinceLastChange.Value = SinceLastChange.Value + 1
if counter.Value ~= 0 then -- if counter variable is not 0
if SinceLastChange.Value > MaxSinceLastCaughtChange then -- If time from last change is higher than selected variable then
counter.Value = 0 -- set counter to 0
SinceLastChange.Value = 0 -- set time from last change to 0
end
end
if char:FindFirstChild("HumanoidRootPart") ~= nil then
local FirstCFrame = char:FindFirstChild("HumanoidRootPart").Position -- Get player's first position
wait(1)
local SecondCFrame = char:FindFirstChild("HumanoidRootPart").Position -- Get player9s second position after wait(1)
local CFrameDifference = (FirstCFrame - SecondCFrame).Magnitude --Get the difference of positions
if CFrameDifference < 0 then -- If difference is below 0
local CFrameDifference = (FirstCFrame - SecondCFrame) * (-1) -- Change it to positive value
end
if char:FindFirstChild("Humanoid") then --If Humanoid exists then
local LocalWalkspeed = char:FindFirstChild("Humanoid").WalkSpeed -- Get players local walkspeed (local walkspeed determines how many studs player create on second)
if math.floor(CFrameDifference) > LocalWalkspeed then -- If difference of positions is higher then his local walkspeed then
if char:FindFirstChild("Humanoid").FloorMaterial ~= Enum.Material.Air then -- If player is touching the ground
counter.Value = counter.Value + 1 -- Add a caught to counter
end
end
end
if counter.Value > MaxCaughts then -- If player passes max counter then
if char:FindFirstChild("Humanoid") then -- If Humanoid still exsits
warn("Exploit detected at player: " .. plr.Name) -- warn it to console
plr:Kick("We caught you exploiting.") -- Kick player from game
-- Do whatever you want to do to player who was detected exploiting
if script:FindFirstChild(plr.Name) then
script[plr.Name]:Destroy() -- Destroy player from script in ServerScriptService (IMPORTANT: Make sure you keep this in this if statment)
break
end
end
end
else
if char:FindFirstChild("Humanoid") then -- If Humanoid still exsits
warn("Exploit detected at player: " .. plr.Name) -- warn it to console
plr:Kick("We caught you exploiting.") -- Kick player from game
-- Do whatever you want to do to player who was detected exploiting
if script:FindFirstChild(plr.Name) then
script[plr.Name]:Destroy() -- Destroy player from script in ServerScriptService (IMPORTANT: Make sure you keep this in this if statment)
break
end
end
end
end
end)
end)
False positives
Those are only going to be seen if player is bounced and is touching the ground at the same time.
License
I use MIT License in this open source which means you have permissions to:
Commercial use
Modification
Distribution
Private use
Liability
Warranty
As this is everything I have to say for you guys, I hope you are having an amazing Christmas.
And most importantly from me,
Stay creative everyone! 