Don't know which one you're talking about but they are all scams. Just stay away from the investor based games section.
Yes they all scammed in the end.. but if there's a counting number of who's the last investor or the last people withdraw the money, you will see & predict how this hyip last long or end soon..
Unless if this web of HYIP or Investing Company, can show you the exact location of their office and the picture of their company.. to make the HYIP looks promising ?? ^_^