Pizza tycoon is at the right place. Simulation is not restricted to several few themes, it's about anything that is simulated.
For example, the Sims would fall under Simulation too, not strategy game. Xcom is a strategy game because more than 50% of the game fall under the tactical phase, so it's not a simulation game even tough there is the Geoscape mode.
Diablo 2 would be an action game, or a "dungeon crawler" game. Not a RPG.
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