Questions about Sixam (Crystals and Spawners)

My advice for the store is to start up a new save go to the lot and save it to your library and then plop it down somewhere. I believe that you'll need to have a sim buy the store so that it will run but they don't need to be played sims. (At least I think this is the case with retail lot I so rarely use ones I'm not running in my games since I can't be bothered to send my sims shopping). I've had good luck seeing a sim selling the My Sims trophies outside the art center lot. My sim didn't have any money at the time or I would have had her buy them just to say I did at some point actually have them in my collection. For my actual Complete Collection run i really would rather try to find the in the wild rather then buying them but we'll see how long I last with that lol.

Yeah those are the hardest collections. Frogs can be hit or miss with the breeding but is generally a lot easier you just need to have the right mix of them and a lot of patience. The space collections can be a bit tricky too since they rely on sheer luck in terms of what "adventure" you pull up. If you have a scientist sim you can also find the aliens in the special logs on the science center lot not just in space.