Sorry, that's a little set back due to the lighting engine that was used, but it was a good trade off. You'll just have to close and reopen the game or load from the menu in game.
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Easiest way is to put only one powder on the scales and then fiddle with the weights until it says both are equal.
Once you know how much a single gunpowder weighs you can then use basic math to measure out what the note on the 2F balcony wants you to measure.
The bug I believe is the same as mentioned below, I recently hotfixed it. Also If you stand in front of the area where you picked up the blue key and then select it from the inventory, you can place the key again to unlock the door.
It has some bugs, which I'm in the process of fixing but, the way it works is:
You need to ignore the scream and just enter the basement, but there are conditions to it.
-When you hear Mika scream, checking the second floor in the room will always get her killed
-If you enter the basement after the scream without a) having Anna alive, or b) getting the compression kit, then Mika will die
-If Anna is alive, but you don't get Mika the compression kit, she will survive with Anna's help _but_ die towards the end of the game because of her ankle in an alternate/hidden death (my favorite death)
In short, to save Mika, you need to get her the compression kit for her ankle, which can be found in the left hall bathroom where the hiding spot/toilet is and just continue entering the basement after you hear the scream.
Sorry for the late reply, doubt you're still stuck by now but if you are:
Red Gem goes into the case in the room next to the basement door (undo the panel with the screwdriver). That will get you the key for the Rumpus Room on the third floor of the mansion.
You need the correct amount of gun powder measured at the scales in the Doll Makers room (North Hall of the Annex)
The amount you need is revealed on the 2F Balcony of the Annex in a note. (through the Dining Room)
It's just a matter of figuring out what each chunk of gunpowder is worth.
Got a full playthrough here without commentary and with both the endings. I had no idea how to open the secret door or what time you get the extra mode though sadly (maybe it's something to do with the cat poster).
I'm so glad you liked it. The perfect ending involves needing all six character cards as well as the spell. You get a character card for saving a character from a certain predicament.
There's also lots of stuff to discover, such as an unlockable hell mode for finishing hard, alternate costumes for Hiroshi and several cheats (which can be found in a notepad file in the install folder) Also two fun easter eggs are constantly clicking on the bathroom door before you first encounter the Oni as well as an alternate Mika death scene (which is my favorite) in the basement of the Old Building (Save Anna but don't get Mika the compression kit)