Almost definitely the only chemistry-based arcade game ever. You control the "molek" and have to catch "atomics" to match a pattern displayed at the center of the board. There are 4 colors of atomics and linking two or more of the same color provides an exponential bonus multiplier, providing the opportunity to risk delaying the completion of a stage to attempt to get higher scores. The phozon is the enemy, and looks like a bunch of colored balloons. It moves in a set pattern around the screen, occasionally breaking up into pieces, at which point each color balloon from the group has a different attacking pattern before rejoining the group. Bonus atomics allow the player to temporarily attack the phozon. Worlds comprise of 3 levels, with each level's pattern generally being added to the previous one, again bringing the multiplier into play. After every world is a sinfully easy "challenging" stage which never changes.