The Sloped IPS Buoy is a variation on the IPS buoy that uses a sloped configuration to extract more energy from the waves. The floating buoy has a series of tubes reaching down into the water at a 45 angle, allowing it to oscillate with both the vertical and horizontal movements of the incoming waves. As in the IPS buoy, the movement of the buoy relative to a piston resting in the water column is used to power a hydraulic power take-off system. Basic wave tank tests have been performed on the design.