You can now choose to play the HARD mode of the game in addition to the NORMAL mode.
This is a completely free add on and it now doubles or triples the play time! Depending on how good of a player you are of course. ;)
Some levels will be really, really hard to complete, especially if you want to go for the perfect score (not loose a single life).
And yes, even we need to play some levels 4-5 times to complete them perfectly without a single life lost! ;)