The rule could be anything, as funny or as serious as you want. The universe will progress in a similar way that it has up until this point, unless your changed rule prevented it from doing so.

Some examples might be:

  • The invention of currency is not allowed.
  • Iron is slightly less stable.
  • The Ancient Greeks are able to cultivate Silphium, which does not go extinct now.
    • Rhynoplaz
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      30
      edit-2
      4 months ago

      You say that like it wasn’t intended.

      Welcome to my world.

    • @Cryophilia
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      154 months ago

      That was gonna be my change

      Everyone horny all the time

    • Midnight Wolf
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      English
      44 months ago

      I’m already in that universe; it’s pretty good

    • @Zannsolo
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      34 months ago

      Nobody is horny and humanity dies hornyness = greed for sex.