The One Tile Challenge is actually really fun!
Normally I don't like doing challenges in the Sims but I have to admit I actually enjoy doing this challenge.
If you don't know what this challenge is, you take a single Sim. Place them in a 1x1 tile box, cheat their money to 0 and they have to earn money and expand their house starting from that single tile. They aren't allowed to leave the house until they have a fully furnished house (ie, bedroom, kitchen, living room and bathroom at the least). That means no outside job, no socializing with other Sims none of that. Just isolated in their little box struggling for money.
For my Sim, I gave her the Mansion Baron aspiration so this will be absolute hell for her. XD But she also has the erratic trait which will come in handy for her social need.