This is an interesting blog post by @malin@dice.camp about how to weave multiple stories/plots together in an interesting way, which makes it possible to organically “catch” the players even if they wander off in an unexpected (read: unprepped) direction.
This can be used in any #TTRPG, but it can also be turned into a mechanic, built into an #TTRPG. It reminds me of Fronts (I think they’re called) in #DungeonWorld.
This is fairly simple way to prep a sandbox. Basic is good when it comes to prep.