Chewsters are little aliens that have come to invade the Earth. The hero of the game, Captain Dan Cornflake, fights these aliens and defends the Earth from invasion, because if Chewsters reach buildings or other objects on the field, they will chew everything, and the city will be destroyed. Captain Dan fights the aliens with the Chewsterfighter he invented, shooting at them to make groups of the same color. Chewsters land in the middle of the central square of the city and begin to multiply threatening to reach the buildings and chew everything they find. Numerous bonuses help to destroy aliens. Once the city is cleared of invaders, they fly to the next city, and the Captain follows them. Sometimes Captain Dan must save not only the city, but also kittens, puppies and plumbers!

The game of Chewsters is a funny casual game, in which a player needs to make groups of three or more aliens of the same color to make them disappear. The game features 50 original levels, each representing a real world city with a world famous skyline, with their real architecture and famous landmarks recreated in 3D. The game features original music and sounds.