Hi, this question has probably been asked and answered but i cant seem to find an answer. Are you allowed to use the dirty coin in the any% categories, its not a pre-order bonus like the defense coin and is still attainable. I have seen a few runs where people do not use it an assume that that's the case but i want to be sure as some of my runs use it.

Not an offcial response here, but to me it should be allowed as long as the demo is still obtainable in order to get the dirty coin.

Otherwise, if someday the demo is not downloadable anymore, the use of the dirty coin should be in a special category.

Dirty Coin is allowed in the New Game+ categories. It actually saves a pretty healthy amount of time in Madhouse NG+ because of the Scorpion Key. I don't know where you'd use it in Easy mode that would be faster? Nevertheless, you can!

It is not used in New Game, it's classed as a "bonus item". I'll add this little bit to the rules to make them clearer.