Number of stellar particles equating to the MW-like stellar mass versus the halo mass covered by the simulation. The simulations used for this study are shown in color, with Magneticum Box2 hr shown in blue, TNG100 shown in purple, Horizon-AGN shown in gold, and Hydrangea shown in orange. Other commonly known simulations are shown in gray. Full box cosmological simulations are in light gray, with M_vir, max(z = 0) indicated by a filled circle while the line goes down to the resolution limit of 1000 dark matter particles. Zoom-in simulations are plotted in dark gray, going from the most massive halo in the set (diamond) down to the same 1000 dark matter particle limit (dashed thin line). Vertical dotted lines mark the MW halo mass, the 10¹⁴ M_⊙ mass threshold used to define clusters, and the Coma cluster mass. Full box simulation suites shown are: Magneticum Pathfinder (Dolag et al. 2025), IllustrisTNG (Nelson et al. 2019b), Horizon-AGN (Dubois et al. 2014), SLOW (Dolag et al. 2023; Seidel et al. 2024), EAGLE (Schaye et al. 2015), Flamingo (Schaye et al. 2023), Millenium-TNG (Pakmor et al. 2023), and Bahamas (McCarthy et al. 2017). Zoom-in simulation suites shown are: Hydrangea (Bahé et al. 2017), Romulus-C (Tremmel et al. 2019), TNG-Clusters (Nelson et al. 2024), Rapsody-G (Hahn et al. 2017), and The300 Project (Cui et al. 2018).