localscript = script.TwoDScript

function GetMass(object)
    local mass = 0
    if pcall(function() return object:GetMass() end) then
        mass = object:GetMass()
    end
    for _,child in pairs(object:GetChildren()) do
        mass = mass + GetMass(child)
    end
    return mass
end

function onEntered(newPlayer)
    wait()
    p = game.Players:playerFromCharacter(newPlayer)
    if p ~= nil then
    if p:FindFirstChild(localscript.Name) == nil then
    local torso = newPlayer.Torso
    local bp = Instance.new("BodyPosition")
    bp.Name = "TwoD"
    bp.position = torso.Position
    bp.P = 1000000
    bp.D = 1000
    bp.maxForce = Vector3.new(0, 0, 1000000)
    bp.Parent = torso
    local bf = Instance.new("BodyForce")
    bf.force = Vector3.new(0, 100*GetMass(newPlayer), 0)
    bf.Parent = torso
    newPlayer.Humanoid.WalkSpeed = 24
    newlcl = localscript:Clone()
    newlcl.Disabled = false
    newlcl.Parent = newPlayer
    newPlayer.DescendantAdded:connect(function()
        bf.force = Vector3.new(0, 100*GetMass(newPlayer), 0)
    end)
    newPlayer.DescendantRemoving:connect(function()
        bf.force = Vector3.new(0, 100*GetMass(newPlayer), 0)
    end)
    end
    end
end

-- run a check once the script is loaded to see if players don't have the localscript

local children = game.Workspace:GetChildren()
for i = 1, #children do
    onEntered(children[i])
end

game.Players.ChildAdded:connect(onEntered)