Visualization of the gaseous, stellar, and dark matter distribution and physical properties for the third most massive halo in TNG-Cluster at z = 0, with a total mass M_200c ≃ 10^15.2 M_⊙. The main panel shows soft-band (0.5 − 2 keV) X-ray surface brightness, while the zoomed inset shows a mock stellar light image of the brightest central or cluster galaxy (BCG). The smaller panels show dark matter density, stellar density, the Sunyaev-Zeldovich y-parameter map, gas-phase metallicity, magnetic field strength, and neutral HI column density. In this final panel, the location and size of the 100 most massive subhalos are also indicated with circles. In all cases, the white circles mark R_200c. This single halo is resolved in TNG-Cluster with ∼100 000 000 resolution elements, split between dark matter, stars, gas cells, and SMBHs. It contains ∼20 000 resolved substructures, including ∼3500 luminous (satellite) galaxies. Not pictured: the cluster also hosts ∼800 SMBHs with M ≥ 10⁶ M_⊙, and the central SMBH has a total mass of ∼10^10.2 M_⊙. Our https://www.tng-project.org/cluster/gallery/ show similar projections across the full sample of 352 halos.