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We introduce algorithms for black hole physics, i.e., black hole formation,accretion and feedback, into the NIHAO (Numerical Investigation of a HundredAstrophysical Objects) project of galaxy simulations. This enables us to studyhigh mass, elliptical galaxies, where feedback from the central black hole isgenerally thought to have a significant effect on their evolution. Wefurthermore extend the NIHAO suite by 45 simulations that encompass $z=0$ halomasses from $1 \times 10^{12}$ to $4 \times 10^{13}\,\mathrm{M}_{\odot}$, andresimulate five galaxies from the original NIHAO sample with black holephysics, which have $z=0$ halo masses from $8 \times 10^{11}$ to $3 \times10^{12}\,\mathrm{M}_{\odot}$. Now NIHAO contains 144 different galaxies andthus has the largest sample of zoom-in simulations of galaxies, spanning $z=0$halo masses from $9 \times 10^{8}$ to $4 \times 10^{13}\,\mathrm{M}_{\odot}$.In this paper we focus on testing the algorithms and calibrating their freeparameters against the stellar mass versus halo mass relation and the blackhole mass versus stellar mass relation. We also investigate the scatter ofthese relations, which we find is a decreasing function with time and thus inagreement with observations. For our fiducial choice of parameters wesuccessfully quench star formation in objects above a $z=0$ halo mass of$10^{12}\,\mathrm{M}_{\odot}$, thus transforming them into red and deadgalaxies.

NIHAO XXII: Introducing black hole formation, accretion and feedback into the NIHAO simulation suite