The Sims 4 variant of this challenge was made by snarky-sims-witch on Tumblr. Your goal here is to have one Sim have 100 babies. This variation requires you to have a color theme per generation, which all have set traits.
One popular variant is the “Not So Berry” Legacy Challenge by lilsimsie on Tumblr.
You can check them all out on The Sims Legacy Challenge. There are many variations of this challenge.
That being said, players obviously would want more from a life sim experience that's unlike anything on the market. The massive popularity of this franchise has pretty much cemented the fact that players are absolutely obsessed with micromanaging the lives of virtual sims as they pretty much take on the role of god. Updated on July 4, 2021, by Ritwik Mitra: The Sims 4 is easily one of the most enthralling and addictive games around. To see 20 of the best mods to make The Sims 4 even more realistic, keep reading! Some of these are just for cosmetic purposes, some add some silly fun, and some make your game even more realistic. Luckily, the Sims community is full of talented people that create custom hairstyles, clothing, furniture, and even gameplay tweaks. While the game has a ton of content for players, there are some players that still like to get a little more out of their game. Between the base game and the additional Stuff Packs, Expansion Packs, and Game Packs that have been released to add even more content and more fun for players, it's basically impossible to get bored while enjoying a game of The Sims 4. The Sims 4 has so much to do in the game.