To complete this quest you need 4 computers to have 4 adult sims playing SimCity on different computers at the same time.
My issue is similiar but not exactly the same. It will not let me complete the goal of having one sim play the Sims on a computer. I've had the preteen and multiple adult sims play the sims on the computer, wasting valuable sim time and it will not complete the goal so I can move on. I do have the option of spending 5LP to skip the task, but I've wasted a lot of RL time to accumulate those LPs and shouldn't have to spend them on a glitch.
Feelin your pain.
Pixieschtick
I didn't see the option to "Play the Sims" on a computer at first, and couldn't complete the task. However, I was trying with a preteen. You have to use an adult, apparently. I also tried the "Play SimCity" because I didn't see the option, but it's at the middle bottom of the menu "wheel".
I also could not complete the task of four sims playing SimCity. I did it twice to make sure. No reward or recognition for having completed it. I had this problem with one or two other tasks as well (one of which was to have two sims hibernate). I just used LP to skip them because I didn't want to mess with it. What a waste!
