The intrinsic energy, E, is similarly represented by the area DZ'Vd under the adiabatic to the right of the isometric Dd.
r is represented by the rectangle MDdO, bounded by the isopiestic and the isometric through D.
It is generally convenient to divide the path into two steps, isothermal and isometric, or isothermal and isopiestic, and to integrate along each separately.
The difference 90-E is represented by the area 9"DdO to the left of the isometric Dd under the isothermal B"D.
Still the game is not without its positive merits, as the first 3D (albeit isometric) Sonic game the visuals looked stunning at the time and were a breath of fresh air compared to the traditional side on 2D graphics of previous years.