How to make a “Steal a Brainrot”-style game in Roblox Studio

local Players = game:GetService("Players")
local CollectionService = game:GetService("CollectionService")

-- 1. Income: every owned item pays its owner each second.
task.spawn(function()
	while true do
		task.wait(1)
		for _, item in CollectionService:GetTagged("Item") do
			local owner = Players:GetPlayerByUserId(item:GetAttribute("OwnerId") or 0)
			if owner and not item:GetAttribute("CarriedBy") then
				owner.leaderstats.Cash.Value += item:GetAttribute("Income") or 0
			end
		end
	end
end)

-- 2. Stealing: hold the prompt on someone else's item to pick it up.
local function setupItem(item)
	local prompt = item.PrimaryPart:FindFirstChildOfClass("ProximityPrompt")
	prompt.ActionText = "Steal"
	prompt.HoldDuration = 1.5

	prompt.Triggered:Connect(function(player)
		local root = player.Character and player.Character:FindFirstChild("HumanoidRootPart")
		if not root or item:GetAttribute("CarriedBy") then return end
		if item:GetAttribute("OwnerId") == player.UserId then return end

		item:SetAttribute("Home", item:GetPivot()) -- to return it if the thief dies
		item:SetAttribute("CarriedBy", player.UserId)
		item:PivotTo(root.CFrame * CFrame.new(0, 4, 0))
		for _, part in item:GetDescendants() do
			if part:IsA("BasePart") then
				part.Anchored = false
				part.CanCollide = false
				part.Massless = true -- so carrying doesn't pin the thief down
			end
		end
		local weld = Instance.new("WeldConstraint")
		weld.Name = "CarryWeld"
		weld.Part0 = root
		weld.Part1 = item.PrimaryPart
		weld.Parent = item.PrimaryPart

		player.Character.Humanoid.Died:Once(function()
			if item:GetAttribute("CarriedBy") ~= player.UserId then return end
			item.PrimaryPart.CarryWeld:Destroy()
			item:SetAttribute("CarriedBy", nil)
			item:PivotTo(item:GetAttribute("Home"))
			for _, part in item:GetDescendants() do
				if part:IsA("BasePart") then part.Anchored = true end
			end
		end)
	end)
end

for _, item in CollectionService:GetTagged("Item") do setupItem(item) end
CollectionService:GetInstanceAddedSignal("Item"):Connect(setupItem)

-- 3. Delivering: touching your own base makes the item yours.
for _, base in CollectionService:GetTagged("Base") do
	base.Touched:Connect(function(hit)
		local player = Players:GetPlayerFromCharacter(hit.Parent)
		if not player or base:GetAttribute("OwnerId") ~= player.UserId then return end
		for _, item in CollectionService:GetTagged("Item") do
			if item:GetAttribute("CarriedBy") == player.UserId then
				item.PrimaryPart.CarryWeld:Destroy()
				item:SetAttribute("CarriedBy", nil)
				item:SetAttribute("OwnerId", player.UserId)
				item:PivotTo(base.CFrame * CFrame.new(0, 3, 0))
				for _, part in item:GetDescendants() do
					if part:IsA("BasePart") then part.Anchored = true end
				end
			end
		end
	end)
end