I was checking out this recently and realized there was no low % category (or i just couldn't find it cause im dumb) so i decided to see which levels u could do without collecting anything (small coins, blue coins, star coins). I've found that both the cellar and the sewers can be done without collecting any coins. the sewer is way more difficult tho so i did a run for the cellar. the other 2 i haven't looked into as much but im pretty confident you have to collect a few coins in the tower. either way low % is beating it while collecting the least amount, so if someone can find the least amount of coins needed for the tower then low % runs can happen there too (along with the final level which i haven't checked at all lol). anyways heres my run along with the full session (the video for the full session is still uploading as of when i'm writing this).