Ben 10 Galactic Challenge is a compilation of 20 Ben 10 Ultimate Alien games.
You can play with 10 Ben 10 Aliens: Ultimate Big Chill, Ultimate Cannobolt, Ultimate Echo Echo, Humungousaur, Jetray, Waterhazard, Spidermonkey, Brainstorm and Swampfire.
Try to finish both easy and hard versions of the game if you are a real player. Use the aliens's firepower and try to defeat all the enemies while making sure their ammo will not touch your body.