There will be codes for each level you advance. If you note them somewhere, you can continue this game where you left. Your progress may be important for you. This feature is made for those who have a limited play-time like less than an hour. They are now able to note their codes to continue their progress in Ben 10 Underworld game. If this is the first time you play, simply click play. The scenario of this game is sad but you are hero to turn it into a happy story. Kevin came and Kidnapped Gwen. He demanded Ben to give him the control of Omnitrix. That is not acceptable and you have 24 hours from then on.