You immediately begin this timed challenge upon touching down in the level. All 100 Purple Coins must be collected in the time limit -- which is rather lenient as far as Mario Galaxy 2 goes! Clones ...

You'll have a brief 35 seconds to collect 100 purple coins. There are far more than 100 purple coins, but you still need to grab as many as possible. Since the clock is ticking as soon as you begin ...