Obligatory Secrets thread.

[Sekru]

Ok so considering that there are several hidden achievements even after finishing the game on the hardest difficulty, I think it's pretty safe to say that there's still plenty to discover.
So anyone found anything new?
We know from before that the ghost boss can be accessed by luring the unkillable ghost into a health powerup, but the hidden achievements and the tracks on the disc 2 of the soundtrack say there's more to be found.

EDIT: updating with stuff that has been found and which I've confirmed to be accurate.

The second secret boss battle can be accessed by entering an area with the gambler statue and destroying it by blowing it up with a grenade pickup (thank you Slimegirl Pit Graveyard Shift).

To get the secret Debug mode achievement, press TAB and F1 in the title screen (Thank you DMac)

To unlock the true ending, it seems like that you must defeat every single boss without getting hit even once (essentially flawless, but even triggering skills such as autobomb will render you incapable of getting it.)
I can now confirm that this is indeed the way to achieve the true ending.
Thanks to Yiaannn for their tips:

Originally posted by Yiaannn:

Originally posted by Halicor:

Somewhat related, I am trying to go for the Flawless achievement

Got my Flawless yesterday, so lemme try and give some tips

1- Optimize your skill tree, I highly recommend getting 30 points before attempting it (25 level ups + 5 overdrives), you can unselect any healing/on-hit/low hp skills as those will be wasted on the run
Putting any remaining points on dice isn't a bad idea, getting a late game Gambling Statue can give a truly game-breaking amount of levels (plus an easy Yuki fight for extra goodies)

2- Don't underestimate Demon, was by far my biggest run ender, I think its patterns are worse than Picayune honestly, sure I can dodge tem most of the time, but sometimes I get too far away and force it to teleport in a way that traps me, frankly in my winning run I simply chained bombs for invenciblity until it was dead

3- High movement speed (230%~) makes Picayune a joke, pretty much everything becomes dodgeable from simply going to the sides. For the few attacks that might still be trouble you can spare a bomb per phase easily

4- Try to fill your 12 mod slots as soon as possible (less if you can luck some of the greek/aphrodite/whatever statue - the one that grants +5% stats and -1 modslot) as soon as you do all your mod rolls will be exclusively from your already installed items, like banning every other item in the pool, great for consistency and synergy

5- Careful not to buildup Curse, most of my enemy hits were Curseformed fishies, even normal lv 3 fishies ended a handful of my runs, aside from that check when adding new monsters each area so you don't add a sniper or something that can shoot, those are the worst

6- Try to choose weapons based on their boss effectiveness, some of them don't scale up great, spreading out too much to melt them quick, Missile is great for being both strong against bosses and mob control at high size

[Stepford]

[pwninthenoobz]

Make sure to interact with the Statue of Gamble as much as possible

[Mu The Slime]

It is possible to gain Curse%. Each % of curse seems to add occasional stronger and more realistic(ish) versions of enemies. If you've seen floating eyeballs, skeletal hands, or notably anatomically accurate fish, those were the result of your Curse value.

Specific statues seem to add 1% of curse when used. The highest I've ever gotten is just 3 on a double loop run. (50 mortality)

Achievements imply that in addition to Ghost listed above, there's also another secret boss named Yuki. Considering that Yuki is the Japanese word for snow in addition to a name, my gut reaction is that it requires something with the snowglobe or general freezing abilities.

[Truk Elohssa]

yuki spawns from grenade pick up on a statue forgot witch one tho

[Mu The Slime]

I can confirm one thing that does NOT produce any special results (sadly)

Getting your mortality level below 0 by immediately multi-using an hourglass statue on the first wave.

That'd be a cool secret for the future

[Mu The Slime]

Grenade pickups can blow up statues. Doing so makes them drop a levelup, and increase curse by 0.25%.

[Mu The Slime]

OK, SO I DON'T KNOW IF THIS WAS COINCIDENCE, BUT I GOT THE TRUE ENDING. ALSO I SUMMONED YUKI FOR THE FIRST TIME.

I was trying to work out how to get the harbinger achievement "I brought a head." so I brought the severed head of OBJ_DEMON to the final boss. Upon killing Picayune, I got new dialog, and a new ending where I saved her.

Is that the unlock requirement? Or did I just happen to try a weird thing on the exact run that the true ending was scheduled to trigger on?

As for Yuki: I got about 4 rerolls pocketed, went over to a district with a gambler's statue, and grabbed a grenade, and while the fuse was priming, exchanged all of my rerolls on levelups. After the dust settled, the statue was gone, and Yuki appeared.

That was done on the same run as above, so, again, that may or may not be a hidden requirement for the true ending.

[Sekru]

Originally posted by Slimegirl Pit Graveyard Shift:

OK, SO I DON'T KNOW IF THIS WAS COINCIDENCE, BUT I GOT THE TRUE ENDING. ALSO I SUMMONED YUKI FOR THE FIRST TIME.

I was trying to work out how to get the harbinger achievement "I brought a head." so I brought the severed head of OBJ_DEMON to the final boss. Upon killing Picayune, I got new dialog, and a new ending where I saved her.

Is that the unlock requirement? Or did I just happen to try a weird thing on the exact run that the true ending was scheduled to trigger on?

As for Yuki: I got about 4 rerolls pocketed, went over to a district with a gambler's statue, and grabbed a grenade, and while the fuse was priming, exchanged all of my rerolls on levelups. After the dust settled, the statue was gone, and Yuki appeared.

That was done on the same run as above, so, again, that may or may not be a hidden requirement for the true ending.

Just defeated Yuki. Can confirm that using the grenade powerup while next to the gambling statue does indeed trigger the fight.

[Sekru]

I was trying to work out how to get the harbinger achievement "I brought a head." so I brought the severed head of OBJ_DEMON to the final boss. Upon killing Picayune, I got new dialog, and a new ending where I saved her.

Just tried bringing the head into the final boss myself but nothing special happened. Can you elaborate more on what exactly you did?

[Crazed]

The shrine of gamble being tied to Yuki is because she's a cameo boss from the upcoming game Gimmiko, if you haven't tried it out yet I HIGHLY suggest doing so

[Nickicchi]

Uhh which one is the gamble statue?
I ignored statues entirely so I have no idea

[Sekru]

Originally posted by Nickicchi:

Uhh which one is the gamble statue?
I ignored statues entirely so I have no idea

It's the one that's a human statue with a circle behind it.
It asks rerolls in exchange for level ups.

[MEGAMILK]

Anyone have ideas on the true ending? Is it from bringing the head or doesn't that work?

[CheeseyHR]

Originally posted by MEGAMILK:

Anyone have ideas on the true ending? Is it from bringing the head or doesn't that work?

that is only for the harbinger achievement

[Mobidius]

Letting the indestructible face anomaly collide with an HP pickup will spawn a skeleton boss.