What to do with S-Bullets

Try to avoid using them when fighting, only use them when you really need them. S-Bullets are like this games gems, you use them to promote troops to make them stronger, to buy bottlecaps for upgrades, and to speed up building's construction. Try to use them for bottle caps and to recruit really good troops when you can. Hope that helps! Also comment your opinions or if you agree! :)

Besides for promotions, I use S bullets mostly to get really good items from from the missions reward loot boxes.