Towers are atoms.
Alkali metals, noble gases, halogens, transition metals, the carbon group and radioactives, each with its own attack.
Features
Bond them into molecules.
Snap two atoms into a bond and get a brand new defender. There are a lot of recipes to find.
Defend a living cell.
Viruses, bacteria and other microbes come in waves along the cell's paths. Work out which combination gets you through a nasty wave.
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