I reached the Antechamber on Day 3, my discoveries and feedback. Spoilers included.

[Paper Boat]

So after 3 days in the game, I managed to get to the ending of the demo. I found this game extremely fun, and I had an absolute blast playing it so far. I disliked that it ended my run a day early by reaching the antechamber, as I had managed to get 3 permanent unlocks as well as 2 room upgrades that would have been fun to use on the last day. Overall, it was an absolute joy to play through and discover new things which had me so excited to go back and explore rooms I had already been in further. I highly recommend a blind play-through if you haven't explored yet.

Some discoveries I've made so far in this game:
There are 3 permanent unlocks I've achieved out of what looks like 4 on the inventory screen, and I have a theory on the 4th.
1. The western garden gate on the outside of the mansion can be opened by turning the garage power on using the breaker box and going outside through the garage. This unlocks the outside room which can give a buff depending on the room drafted.
2. The gem mine will allow you to start the day with +2 gems. This can be unlocked by solving the VAC puzzle on the breaker box, done by first setting all of the lights to purple, then setting the lights to {off} {blue} {green} {white} {red} {purple} These codes may be found in the email on the office computer.
3. The apple orchard will allow you to start the day with +20 steps. This is unlocked by entering in the code 1128 in the padlock of the gate by the camp site. The code was discovered by restoring power to the dark room after entering it and using a magnifying glass on one of the pictures.
4. I suspect that the 4th permanent unlock is related to the gymnasium, as all 3 of the other unlocks required the breaker box to achieve.

There are 3 levers which are required to open the entrances into the Antechamber, 2 of which are fairly easily accessible.
1. A lever exists in a room opened by the Silver Key, behind a locked door. This opens the east door of the Antechamber.
2. A lever exists in a room opened by the Secret Garden Key, after a simple wind vane puzzle. This opens the west door of the Antechamber.
3. A broken lever mount exists in the greenhouse room, which is supposed to open the south door of the Antechamber. I have not been able to open this door yet, however I have obtained a broken lever item from the workshop. To note, the workshop will allow the Sledgehammer or the Shovel to be combined with the broken lever, however it also wants a 3rd input I have not determined yet.

Rooms:
Security room: The terminal's password is swansong (most likely a reference to H.S. Sinclair's niece Mary Matthew Jones (Marion Marigold), who wrote under an avian pseudonym, and stopped writing after a terrorist attack that she was somehow involved in). Blue memos are true, red memos are false.
Chapel: While it takes 1 coin every time you enter this room, money can be re-obtained once by lighting the candles using the combined items of magnifying glass and metal detector. The stained glass windows also are numbered with different gods/goddesses(?) which all have different themes. The gardener's journal refers to the goddess in window 1.
Office: I have not yet discovered the code to the safe, however there is a red memo that can be found in the conference room stating the password is 9083. Accessing the email allows for the solution to the VAC puzzle on the breaker box.
Music room: Contains sheet music 1-4, which contain the bold words {first} {word} {on} {the}. Combined with the 8th page found in the workshop, {message}, I suppose that it reads "First word on the pages is the message." This results in " Find among the white _ _ _ stones. This might be related to the flowers alluded to in the gardener's journal in the apple orchard. Alternately, this might refer to the dig spot between stones near the campsite near some white trees, which unlocks the conservatory room blueprint.
Laboratory: Reading the periodic table with the numbered chart results in " Push three up after nine." Most likely to do with the lever puzzle, but unconfirmed as I have not seen the Boiler room yet. There is an experiment chart on freezing water that refers to the Freezer, which I have not been inside yet, but saw in the draft list (on rank 8 or 9? Cannot remember which.)
Workshop: Combining different items results in new items. Magnifying glass and metal detector allows you to light candles and ignite fuses. Candles can be lit in the Chapel, I have not found any fuses yet, it does not refer to the missing breaker for the cabinet on the breaker box. It might be for something crafted in the laboratory. Additionally, the sheet music refers to hand carved stone, which I was able to observe on day 2 as the letter E, and day 3 as the letter L.

[palepessimist]

Originally posted by danila:

Originally posted by palepessimist:

Did anyone get a conservatory room? I saw it once, but didn't have enough crystals to get it. Also I got an attic, there was a lot of items and a note with a date april 12 at the top.
Another thing - the basement key. I think it will be useful in a different setting than opening a normal door in the house, because I tried it out a lot in a few rounds, nothing (maybe it's a demo thing). But the key looks like the hole for it would be horizontal.

do you remember any details of the game day, where you had the option to draft Conservatory?

was the option to draft it in a corner of the whole estate? (specifically, my theory, north-east of the estate, since it’s the only corner with rich soil, and the graphic of Conservatory aligns well[imgur.com])

and it probably also depends on something else in game to happen, since usually, even if you have Conservatory “unlocked” it still doesn’t show up.

so you may have done something for it to happen, even if inadvertently

I don't remember much, but I think it was in north-east region.
I was on day 4 and I was re-running that one day a hundred times to find new things, especially fourth valve. XD But I get it, they wouldn't let us finish it.
I opened some safes (drawing room, boudoir and office) and I had three permanent additions (I didn't really cared for the grotto, you can't do much there).
I unlocked planetarium and I had 2 stars.
And I think I had a lot of green or yellow rooms.

The demo left me very excited for the full game (the demo left me but I will never leave it - I guess until they remove it haha), I love this type of games, especially with keys, because key = door/item to open. I am a very curious person, what can I say. XD

[palepessimist]

Also I realised I always get garage option in the middle of the first column (going A4 to A5 from the bottom), if anyone needs that info. Unlocking outer room at the day 1 is so good. XD

[rsdworker]

Originally posted by Helen:

Hi there, just dropping in to mention that we have a very active and enthusiastic community Discord server to talk about your experiences in Mount Holly and even ask for hints with certain puzzles: https://discord.gg/BluePrince should any of you be interested in joining.

thank you :D i was trying to locate discord - could have put in important links or on game menu to access it