Most games aren't simulations. The difference between a simulation and a game that isn't a simulation is that... the game is usually way more fun, and a simulation is usually very difficult to play. Take racing games. Cars handle way differently in racing games than in real life, which someone will find out if they try to drive a race car simulator and find themselves quickly spinning out. (Hopefully they learn it on a simulator. I've seen people learn it in real cars; it is an expensive lesson.)