I only played it one day, and didn't try the 3D version. The normal version was okay but not spectacular. I didn't run into any repeating levels, but it is a little repetative because you keep shooting the same type of targets over and over again as the game guides you through the level. You don't have control over the game. You shoot the required amount of targets to advance, or the time alotted for that area, then the game moves you to another section. The reload time is kind of slow, which allows the enemy to inflict damage on you while you're waiting.