How many levels are there on run?

"There's only one. When i finished the game before it said enter high scores or play again."

That is wrong. A friend said that there were 50, but you will have to complete it to find out!

There's more than 50 levels on that game, i haven't completed it yet, but I'm on level 51.

Hi, I've played it on the easiest mode and all I know for sure is that easy mode has only 50 levels. I'm not sure about the others though I'm still working on beating it on the fast mode. Also, beating the easy mode unlocks intense mode (I just thought that was interesting).