Summary: This seems like its the game that never ends. The "tutorial" levels have taken me over an hour to get through because each of the turtles have there own special ability. Its one of those games where you can't really die you just restart from a save point.
Summary: Difficulty: I'll just say right off the bat that I beat the game in 5 and a 1/2 hours when I rented it and it only served as 65% of the game completed. As you unlock the mini games, you can go back and beat the time trials so that you can unlock movie trailers, artwork and the like.