How to make moving background scroll infinitely?

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2

Maybe this will help:

task.spawn(function()
    local x, y = 0, 0
    local INCREMENT = 0.1

    while RunService.Heartbeat:wait() do
        image.Position = UDim2.fromScale(x, y)

        x -= INCREMENT
        if x < -1 then x = 0 end

        y -= INCREMENT
        if y < -0.5 then y = 0 end
    end
 end)

Edit: I just saw your issue – your image is moving out of the screen. Maybe scaling your image to a bigger/out-of-the-screen size will help. Try this: image.Size = UDim2.fromScale(2, 2) and change the AnchorPoint to accommodate the size.