You can get lots and lots of people and animals. Sometimes you collect mysteries like the lepricorn, the hipster, the wail and the drop bear. The roads on crossy road get bigger or smaller. When you are so close to getting on the other-side and you are not quick enough, a car or a truck runs over your foot and you get caught in with the car. The first thing you get when you start crossy road is a chicken.
I think crossy road is the most famous game I've ever heard of.