I was hoping to do a full run of the game for 400% AKA 100% on both helen and will, and then another 100% on the true endings. Rules being the obvious start to finish on each side of things while having to complete everything in entirety.

Sadly it's not possible. Last stamp is impossible to get and after years of searching we still don't know how to get it....

hey man, as a runner of this game, this unfortunately isn’t even possible if you’re including the my dream stamps in 100%. there’s one stamp that for the life of us we haven’t even able to get :/

all a ranks + true ending is certainly possible though, it just won’t be true hundo

Yep and until we figure that out, I have to shoot that idea down for now. Buuuuuut maybe you can figure it out and post your findings in the discord server. It'll save poor Bora a headache and a half.