Ive been thinking about fixing up how 100% works, but i have found a few problems. To 100% this game, you need all of the trophies, all of the masks (just a normal any% run gets you that), and all costumes unlocked. But as far as i know, medallions are NOT required. This would basically be around 10 hours because you need to do a any% run to get all masks, and still need everything else. I was thinking of having 100% NG+ but then i realized a major flaw. And that is the fact of scooby snacks being collected. You need scooby snacks to buy all the costumes, and having some already makes it somewhat invalid. So instead, im thinking of making 100% a misc category and having something like All Medallions and All Medallions NG+. not sure on All Trophies NG+ being a thing tho ( regular All Trophies can be a thing). But All Costumes would just have to stay without a NG+

There are plenty of 100% runs that exceed 10 hours, so I don't see that as a valid reason to modify 100%. Adding other categories has some potential depending on how much interest is expressed by other members of the community. NG+ will likely never exist for this game because it does not change the way the game is played in a significant way.

For more than 70% of the medallions, you need other characters only unlocked by beating the game. That's saying that you need to beat the game and then play all the stages again to get all the medallions. NG+ for that would make it a little easier and not a waste of time. That is if you want to make all medallions a category.

There is a trophy for all medallions, so if trophies are to be included in 100% (which they should) then medallions are also required for 100%.Even if medallions were not required, you would still have to go through the game again in explore mode for costumes. As for snack collecting for costume purchasing, there are multiple games where grinding for currency tend to be required for 100%ing. I haven't tested it myself, but I think the amount of snacks you would be able to collect within two runs through the game (in story then in explore mode) would be pretty close to the amount required for all costumes. However, we could make it that only gathering all the costumes, not buying them, would be the requirement if it turns out excessive grinding is necessary, but that would be a last resort.