A1 is visiting the King's castle, but does not have enough gas to fuel her space craft all the way home to her home planet. Create fuel by using your electron cannon to split atoms, causing chain reactions whose energy can power her craft.
Click an atom to add an electron to it. When an atom has reached its maximum size, further added electrons will make it split, sending electrons in all four directions.Try to make as long chain reactions as possible, since each 3 atoms that are split in one move will grant you a free electron to use. Make sure you don't run out of electrons to add, or the game will be over!
The later levels introduce green atoms. Green and pink atoms cannot split each others, with the exception of the Lightning atom, that can split any atom. Use them wisely!