Depending on the username you play with, you can choose different types of balls. For instance, if your name is Mexico or Chile, you can play with the Mexican or Chilean flag.
The gameplay is really simple: by keeping your finger pressed on the screen you can move freely from one side to the other, dodging other players that are bigger than you, and also trying to absorb the smaller ones. If you're unfortunate enough to be absorbed, you just have to start over.
In Nebulous you have to be really careful about black holes, as if you fall inside one, you'll be split into lots of smaller balls. Normally, this would be really bad, but it can also be good if you are running away from an opponent.
Nebulous is an original and fun game with a gameplay that's very similar to that of Osmos. The main difference, of course, is that this game is mainly an online game, and much faster.
Requires Android 4.0.3 or higher