Combine colorful atoms with spinning electrons to create combinations that Pop! Two types of puzzle modes to challenge your brain! An atom's color shows the number of electron directions filled. 4 - Red, 3 - Yellow, 2 - Green, 1 - Blue and 0 - Purple Combine atoms to add or subtract electrons. Matching electrons subtract. Differing electrons add. In puzzle mode, add or subtract electrons to change an atom's color. Match the color combination to pop all the atoms. In cascade mode, combined atoms with matching electrons pop and the remaining unmatched electrons are shot off, possibly combining with other atoms causing a cascade. Pop all the atoms using the least number of swipes to get the most stars!