I started this challenge with four Sims that were nearly clones of each other already. Although they looked different, all four had the same traits and lifetime wish. Their traits were over-emotional, loves the outdoors, virtuoso, artistic, and, most importantly, ambitious. All of these traits either revolved around the fact that I planned on using the guitar exploit to earn money, the desire to give them extra happiness points, or both. Their lifetime wish was Swimming in Cash.
Since I was going to use the guitar exploit to earn money for them, the one community building that I chose to build was a subway, which I put across the street from their house. After putting copies of the cheapest house I saw in the library, The Swamper, in all of the empty lots in town, I proceeded to move my Sims into a Swamper and immediately tear it down. The only things that I wanted to give them to start out with was giving each of them a nice bed so they could get the +30 well rested moodlet, two Hypnotizers total, and a guitar each (although I actually bought the guitars after they had learned some guitar skill). I also bought a stereo so that they could have an additional good moodlet while learning the guitar skill.
The fastest way that I found to learn the guitar skill was to have them use a Hypnotizer in pairs. In each pair one would hypnotize the other to play the air guitar repeatedly. They kept doing this all the way until the Sim being hypnotized reached guitar skill six, and then switched off so that the others could reach guitar skill six. Once they all reached guitar skill six, I had them all cue up as many performances as they could in a row, while I went into map view. This made all of the performances go by extremely quickly, and I continued this process until they each had 200 performances. I then had them all go play for tips in the subway, and they all very soon satisfied their lifetime wishes. I believe they had enough happiness points at this point to each buy clone vouchers, since they had been getting some easy to satisfy guitar-related and purchase wishes. I had them do this, and then aged up all the clones to teenagers. I had the original Sims go back and do some more playing for tips in the subway, and sent one of them to go buy a camera in the consignment shop as soon as possible (this is easily doable if you buy all of the items in the consignment shop until the camera shows up). I also bought about 20 Trees of Prosperity, which were useful for achieving and spawning wishes once they bloomed. I sent the clones to work on gaining happiness points. This was achieved by satisfying various easily achievable wishes, using photography to spawn and satisfy wishes (I passed the camera around from one to another of them), having their parents give them driving lessons, and using the Trees of Prosperity to spawn and satisfy wishes. I tried to earn 5000 happiness points within a day of when each ambitious Sim was created, and 10000 happiness points if they were not ambitious. The rest of their happiness point requirement was satisfied by their lifetime wish, Swimming in Cash, which I had them choose upon reaching young adulthood shortly after midnight (they were teenagers less than 24 hours). A bit before midnight I also bought four buildings and moved out two of the original four Sims, to make some room in the household for new clones. After the Swimming in Cash lifetime wish was satisfied by having the remaining two of the original Sims make $50000 simoleans playing for tips in the subway, I sent the newer clones to the science building to make clones of themselves. I had the first pair clone themselves and then move out, to make room for the clones from the second pair. I had the second pair stick around so they could teach driving lessons to the teens after the teens received the wish, and being them various other places after curfew if necessary. I moved this pair out shortly before aging the new set up to young adult, and the cycle continued. By the third generation, I do not think that any of the clones retained the trait ambitious, so earning enough happiness points on them became more difficult. I still managed to get them aged up twice within 24 hours of them being adopted and moved out, though.
Once I had enough money I bought all of the remaining buildings and properties in town, and upgraded all the properties. I then worked on happiness points on each of my original Sims, one at a time. When the first one had enough happiness points, he cloned himself, filling up one of the empty slots in the household. From this point on, each Sim had to move out before the next one could clone themselves. Once the second of the original Sims got enough happiness points to clone themselves, I had the other Sim from the first generation move out to make room, since the household already had nearly enough money to buy all the remaining houses in town. From this point onward, I normally only had my original Sim teach one or two driving lessons per day, and the rest had to earn the happiness points through other means. The remainder of her day was spent playing for tips in the subway. I made sure to have her always playing for tips at around midnight, while I aged up the rest of the household to young adults in rapid succession. I even had them all cue it up simultaneously. Even though they still took turns spinning around and aging up, it was helpful to have them waiting in birthday position, rather than celebrating all of the birthdays.
I think that pretty much sums up everything. It was 13 very intense Sim days before the whole neighborhood was taken over. What goes on after that point is up to them.
