The aim of the game is to assemble molecules by sliding the atoms which are spread in the game area. However, every time you slide an atom it won't stop moving until it meets an area block or another atom. It's up to you to find the right combination of moves in order to compose the molecule which is displayed in the game area. And all that in a limited time frame, of course!
Every four levels, you are given a picture of a famous scientist in the form of a scrambled sliding puzzle. These are bonus levels where you can't lose, and you can simply skip them.
Each solved level yields score points. You can view your total score and compare it to other players by viewing the global leaderboard. To improve your total score you need to finish all the levels. The faster you solve the levels, the greater the score you gain.