Challenge: Beat Broken Blue Bully Belt using Toad without the Tanooki suit. I tried a few times, but decided to move on for now and come back after I've beat the game.
I've managed to do this with Mario. Made me burn through like 30 lives or so. It really forced me to get acquainted with the momentum mechanics in this game! It was a fun challenge though, but I probably won't do it as toad till I do a small character only run through,
Also, Even though I'm not 100% finished with the game yet (still gotta beat the true final level as Mario plus beat all the other levels as the other characters), I've started another run through, but there's a twist:
I must beat the game while collecting the minimum amount of coins (I'll get the green stars that require coins after that), and this is also a no death run, so no checkpoints!
I've beaten the first two worlds in this run through, and so far, it's not too difficult, but certainly noticeably harder. I had to miss 4 green stars on world 1 because of the no coins thing. However, World 2's castle was actually sorta a pain. There's two parts where a Bullet Bill hits a crate, and for some reason, you automatically get a coin if it hits the crate! So I had to use Cat Luigi to deflect the bullet bill till the cannons were off screen. However, I screwed up, and lost both cat suits at the end of each cannon, so I wasn't able to get the gold flag since the blocks to the flag were covered in coins. I'll try to get the gold flag as the other characters in that level as soon as I get the Tanooki suit, which should hopefully make deflecting the Bullet Bills easier.
I think I'll to get the gold flag with the other characters as soon as I get the Tanooki suit. The only really annoying part is that if I accidentally get a coin, I have to restart to the Wii U menu, since otherwise, the game actually save when you quit. The game saves the amount of coins even if you exit a level too! Overall, I expect this run through to be quite a nice challenge!