I "just" (160+ hours in) started a play through of space exploration at the recommendation of an HN comment. Super excited to see an official expansion that adds this kind of thing! https://news.ycombinator.com/item?id=36561847 My ideas list for interesting Factorio challenges (apropos of nothing): - Products with a shelf life (must be consumed within 15 minutes or it turns into a "waste" product) - Products with "re…
IIRC some things can require charcoal filters, in which case you have to build the filter frame and filter, get it to the machine that needs it, then recover, replace and regenerate the used filter.
Another fun challenge is "feedback", where a later step in a production line produces as waste something you can consume at an earlier stage.