The matriarch Sim can't have a child with the same Sim twice, and they must earn money without leaving the home (I find choosing a career as a painter or an author is most effective for this). There are variations to the rules (and a lot of them), but the gist of the challenge is for one young adult matriarch (though you can customize gender however you like) to have 100 children before they age up to an elder in the game. The 100 Baby challenge was originally created for the Sims 2 by a player who goes by the name Amiisays and reworked for the Sims 4 by Snarky Witch, who posted the official rules on their Tumblr. I admit my Sim kids were never this happy when I tried the 100 Baby challenge. Here are seven popular challenges to try on the Sims 4 to shake up your next session: There are rules to each challenge and some can be pretty strict, but don't forget that the point is to have fun and make the challenge your own. Challenges are usually created by players and shared online to make gameplay more fun or difficult. Even with all of these options to let your creativity run wild in The Sims, sometimes gameplay can work itself into a boring rut.