Hmm people seem to like making buildings in sims. I am more towards breeding. As for challenges, you mean like supermaxing skills?
Lucy in the sky with green diamond.
The game announced that she learned driving, so I cancelled her Learn to Drive action and get her home. I waiting for a while but she is still not home. So I focused on her and guess what I found.
Also, see that mountain behind her? She just clip-walked through it. Moments later she was found by the curfew patrol, for breaking curfew as well, while really her mother was with her all the time, teaching her to drive. She then magically teleported back home, but has to complete the Get into Police Car as Passenger action, so she spent 3~4 hours walking back to the police car.
The whole thing was glitched to holy hell.