Coffee Roaster is a solo pool-building game. You pick a variety of coffee beans you want to roast, and place a number of tokens specific to that variety into the bag. Each turn, you select a number of bean tokens randomly from the bag to increase their roast level. When you are finished, you create a cup-testing to check the taste of your coffee and score points accordingly. Every variety has its own target roast level, but reaching the target is not enough for perfect roasting; you also must even out the roast level of each bean, while not spoiling the flavor of that variety.

You also have to shift out smoke tokens and burnt bean tokens that impede your roasting, and reject bean tokens that spoil the taste. It is key to control the contents of your bag utilizing flavor effects and unique effects caused by putting tokens on the roast board.

The game consists of 22 varieties of beans. In one game, you attempt to roast three of them, and your roaster title is given based on the total score. Enjoy the world of coffee-roasting, and hope for the ultimate title "Meister".