Yesterday, while cleaning up my media center, I found my copy of Ratchet & Clank: Into The Nexus, which I bought sometime before Christmas last year. I had been pretty excited about this game pre-release, what with it being the first "traditional", albeit shorter than usual,...
The timer is your biggest enemy. Get the high scores by finishing levels as quickly as possible.
That said, you don't die if the timer runs out. You just lose points.
You might have to backtrack to find all the coins.