Close Encounters of the Nerd Kind (Gamer Squad 2): Gamer Squad #2 by Kim Harrington
After their adventure, Bex and Charlie swear never to play Monsters Unleashed again. Then Veratrum Games Corp releases a new augmented reality game featuring aliens instead of monsters, and they can't resist. Everyone loves it. But when they open the game near a radio telescope, it attracts REAL ALIENS. One is kind; the other . . . not so much. Can Bex and Charlie capture the bad ET before it destroys their town?