Hi there,

Space Age has tier 2 modules depending on space science packs plus T3 modules depend on an additional science pack:

• speed T3: metallurgic
• efficiency T3: agricultural
• productivity T3: agricultural + biter egg handling

Maybe you can have similar requires if SA is installed to give it a harder challenge?

You can find the repository here: https://github.com/wube/factorio-data/tree/master/space-age

Please then add a "?space-age >= 2.0.xx" to your info.json to reflect optional support of it.

And what special ingredient would you propose?

At least space-science-pack and then something that is SA-specific.

space-age/base-data-updates.lua states:

table.insert(data.raw.recipe["speed-module-3"].ingredients, {type = "item", name = "tungsten-carbide", amount = 1})
[...]
table.insert(data.raw.recipe["productivity-module-3"].ingredients, {type = "item", name = "biter-egg", amount = 1})
[...]
table.insert(data.raw.recipe["efficiency-module-3"].ingredients, {type = "item", name = "spoilage", amount = 5})

So I would recommend something SA-specific. Pollution means a lot of CO2, so let's take carbon and amount 5?