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The way to detect the mouse scroll wheel in Gosu is as follows:

require 'gosu'

class MyGame < Gosu::Window
  def initialize
    super(800, 600)
    # Your initialization code here
  end

  def button_down(id)
    case id
    when Gosu::MsWheelDown
      puts "Scrolling down"
      # Handle scrolling down logic here
    when Gosu::MsWheelUp
      puts "Scrolling up"
      # Handle scrolling up logic here
    else
      super
    end
  end

  def update
    # Your update logic here
  end

  def draw
    # Your drawing logic here
  end
end

MyGame.new.show