In Marble Blast, players must use their mouse to aim and shoot marbles at the field of colored marbles. By creating groups of three or more marbles of the same color, players can make them disappear. When players achieve a large combo, they will receive a special marble with a powerful effect. The goal is to clear all the marbles before they reach the exit. Players can use the number keys to activate items they find throughout the game, and should try to do so quickly to get the best ending.