This may seem like a really dumb question but how does one read a technology chart? All it shows is about 10 different charts with numbers like 18 next to countries under a specified technology? What does this mean?
Before terraforming Mars, Surviving Mars is required: Paradox Interactive; Steam.
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A huge number of A&A games exist. This question should be posted to the specific game you're asking about. Look it up using the search box at the top of the page. You probably want the Rules forum of that game.