I had already beat the 3DS port and just a few days ago, I beat the original Wii U version and one thing that really pissed me off was how you lose 5 hearts, instead of just one, when using "Mellow Mode". This wasn't a problem in the 3DS version, but it was in the Wii U version. I even died more times on the Wonderful World of Wool stage in the Wii U version, than in the 3DS version and don't get me started on the boss tent, that was dreadful! The first few ones were easy but the later bosses, had me dying repetitively. When I finally got to Baby Bowser, I must have died like 20 or more times. It's so fucking hard to avoid his attacks and even hit him with a yarn ball in the first phase of the battle and it's very easy to make to the second phase, with only one heart. I didn't die in the 3DS version, but I kinda came close. I still think the Wii U version looks and plays better, but the 3DS is a lot easier with the Poochy pups and losing only just 1 heart of health in "Mellow Mode", instead of 5.