User blog comment:IsaiahScribblenauts/Friday Sim Talk 4/@comment-1519608-20180608155229

For The Sims 2, the testing cheat code is "boolProp testingCheatsEnabled true." In my experience, the testing cheats in TS2 are way more extensive and powerful than those found in later titles.

I think something that many younger Simmers don't necessarily appreciate is just how good The Sims 2 was for its time. Compare TS1 and TS2 directly, and you can see just how many improvements came into the game in those four-and-a-half years between TS1's and TS2's releases. Ageing, (basic) genetics, family trees and formalized family relationships, multiple life stages, a fully 3D environment, much more advanced Create a Sim, improved Build and Buy Mode tools, seven-day weeks, days off of work and school... To me, the differences between TS2 and TS3, with the exception of the open world and a few of the features that that entails, are far more subtle. TS3 wasn't the huge revolutionary leap forward that TS2 was.