Mario Party 8. Just beat story mode and unlocked Blooper.
I still have plenty of things to unlock and trophies to buy, and I gotta admit it´s not that bad as I remembered. However, the final battle in story mode is THE EASIEST in any Mario Party. You can´t even lose it because you get infinite continues every time you die!
SMB2 (All-stars version). I never noticed this before, but one of the palletes Peach goes through while invincable gives her pink hair and a blue dress. *coughPeachisKumatoracough*