  SUPERBOX-10 is the successor of SUPERBOX, a particle-mesh code where
additional grids and sub-grids are applied to regions of high particle density.
Previous limitations have been solved. For instance, the vertical resolution is
improved considerably when flattened grids are used. Since the computationally
most intensive part is the Fast Fourier Transform, we introduce a parallelised
version using the library FFTW, resulting in a speed-up of a few. The new
features are tested using a galaxy model consisting of an exponential disc, a
bulge and a dark matter halo. We demonstrate that the use of flattened grids
efficiently reduces numerical heating. We simulate the merging of
disc-bulge-halo galaxies with small spherical satellites. As a result,
satellites on orbits with both low eccentricity and inclination heat the disc
most efficiently. Moreover, we find that most of the satellite's energy and
angular momentum is transfered to the halo.
