The game has 16 tiles, and you start with two tiles with a picture of Adeline Bourne. In each move, you swipe tiles either left, right, up or down (using your arrow keyboard keys) in order to match the pictures and eliminate tiles.
For example, when you swipe an Adeline Bourne picture tile to another Adeline Bourne picture tile, you cancel it out and turn it into a Gertrude Elliott tile.
When you swipe two Gertrude Elliott tiles together you'll get a Cicely Hamilton tile... two Cicely Hamilton tiles will create a Decima Moore tile and so on...
Every time two tiles touch they multiply and a new tile, either an Adeline Bourne or Gertrude Elliott tile is added back to your board. When you run out of combinations or space on the board, you lose.