Use numbers 1 through 3 to change the state of all particles and the main state. Use the arrow keys to change tool. The red circle with the plus will add a red particle. The blue circle with the plus will add a blue particle. The cube will change any particles you click to a solid. The droplet will change any particles you click to a liquid. The cloud will change any particles you click to a gas. The main state display says what state any new particles will be.
