Hover over the aliens (or click if autoclick is turned off) to earn resources and xp. every level will grant you a research point that you can use to buy researches. plan carefully what researches are you going to buy. at what point you buy them may have a big impact on your income. percentage based researches will autoupdate but multipliers will multiply your current number affected by sequences and more. research wisely! you can export/import your game in the menu. in case of wipe there’s a copy of the export in a cookie called cookieste that updates every hour. wiki: http://save-the-earth.wikia.com/wiki/save_the_earth_wiki
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