Ready for a tour through the US of A? There are 10 levels worth of bubble shooter games, find the difference games and slider puzzles. First shoot to remove all bubbles by shooting bubbles up and creating groups of 3 or more of the same color bubble. Then find all the differences in the 2 images and, finally, complete the puzzle by swapping 2 images. On to the next level...there are 10 total. Have a delightful time 'traveling' the country when you play Discover USA!