What in your opinion in SMG is the hardest star.

Mine are the Purple stars. They are a pain. Especially the ones that are timed and the ones in were there is a threat of falling after collecting 93 coins. 

Dreadnought Garbage Star.

purple comet star @ toy galaxy

 To be honest, I don't know why people are having trouble with this. I found it to be quite easy. But oh well, I'm sure you found a star that was easy that I probably found was hard.

Bouldergeist on Daredevil comet !

Arrrghhhh !

Luigi's purple coins & Trial Galaxies

PS: Why does everyone think daredevil stars are hard? I got most of them after 5 tries each at most.

I had a problem with daredevil bouldergeist. He's easy now. Daredevil lava spire took me an hour!!!

 AHHH!!! That was is easy for me now though. I can get it on my first or second try.

haha yeah daredevil lava spire as a wreck for me too, spent half an hour trying, got frustrated and gave up. went abck the next day and got it first go :P go figure..

I was going crazy when I tried Luigi's purple coins in Toy Time for the first 20 times... Afterwards I finally realised that I didn't need to get all the coins, and after about five more tries I managed to do it!

But the purple coin stars were really the most difficult ones for me, the one in the desert galaxy was quite hard for example.

the hardest star for me, but one of the most fun was dreadnought purple coins (battlerock one was fun too).. i loved Luigis purple coins too, didn't find it hard