A good majority of app downloads are in the form of mobile games. These games come in many forms, but the favorite category of games is physics based games, with puzzles to solve in free time. Bubble Grubble fits the description of a perfect game to play whenever you’re bored or when you have a little extra time on your hands. It’s one of those games that can keep you entertained for as long as you need it to, keeping your mind trying to figure out the next puzzle. Bubble Grubble is a simple looking game, but it takes thought to feed those birds.