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.
  • Postmortal_Pop@lemmy.world
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    2 months ago

    This is a problem I’ve always had with Square grids in D&D and it never occured to me that from character perspective a character is warping space to move slightly further for the same amount of movement.

    • frank@sopuli.xyz
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      2 months ago

      Also non Euclidian! Hexagons (the bestagons) also tesselate and fix that problem nicely