Well i agree with Shiyo, but well theres a Major leap in difficulty if you select 4 star & try Duo that.

They really should balance the difficulty option a tiny bit better than it currently offers.

It's no wonder new players might pick 3-4 star and get their ass whooped & then lowers
it to 1 & completly miss out the great SP they could have gotten at 3 star.

Advice to new players, Trial & error is your friend and dont be afraid to get you ass whooped by a Wharf Rat.
Get back up & spank that bad boy!