Would be possible to have a version to not require Shop Grid API?
At the moment, and unsure if it can or will be ever fixed, the current implementation of Shop Grid with Fourth Key is not usable with a controller.
When I try to select one of the arrows of the Shop Grid, or to select an item around the same area, the screen / cursor gets stuck and cannot be controlled by the controller anymore.

@deesof thank you I couldn't figure it out

Has anyone beat A 20 heart with this?

The thumbnail image was made by u/Exylas.

you can disable the difficulty bump in the options, it should disable it if you're in the middle of a run (probably)

Are the final act difficulty and the fourth key completely separate changes? I was originally under the impression that obtaining the fourth key would allow you to optionally ramp up the difficulty of the final act when you get there, but after reading the description again, that doesn't seem to be the case.

good idea, will look into

spire biomes mod has a biome that gives bonuses for the keys you have aquired. maybe add a bonus for the amethist key aswell? since the biome gives +1 to strength dexterity and focus for the ruby saffire and emerals keys why not make the amethist one give +1 energy?

patch is out now. fixes some bugs when running with Pale of the Ancients, Downfall, and sandtag's bundle relics should now be compatible as well

i see the issue, my patching was really bad but it's an easy fix. the issue is that the act 4 difficulty increase isn't being fully applied, luckily doesn't seem anything else is busted. expect an update sometime today

thanks for letting me know, also that's a good idea

i have 0 idea on code, but ill just leave the idea out there, i think it'd be cool if the purple key was gotten by defeating the shopkeeper on downfall

heads up: currently broken with the new downfall update

yeah i'm a big of Hug's work, I have an idea for Padlock in HugYouRelics, but I haven't seen enough of HugYouColours to think of anything yet but i'll look into it

Have you seen the HugYouColours mod? Combining this mod with that in some way would be really cool. Like you need the fourth key if you take a companion or something.

Pale of the Ancients is a really cool mod, worked with Fourth Key no issue. it turned out to be relatively easy so I added an interaction for it

currently no I haven't patched Fourth Key to work with Pale of the Ancients. I'm not sure if they can even be launched together. I've been quite busy recently but after I patch one of my other mods I can look into adding support in the same way I did for Downfall

that mod has a special fourth act that you can access even without any key but having keys upgrades a relic that you are given at the start of that act and each key grants a special bonus.

is this compatible with Pale of the Ancients?

777 lucky mod!

Calm down Satan.

감사합니다.

와쳐의 열쇠를 추가하고 4막의 난이도를 올리는 초하드모드임 지금도 20승천은 충분히 어려운 난이도인데 3막까지의 숙제가 하나 추가됨 여기서 끝나지않고 4막의 창방과 심장 양쪽을 강화시켜서 전체적인 난이도를 올림 와쳐열쇠의 아트는 굉장히 자연스러워서 4막으로 가는 연출도 어색하지않음

This is technically a block card. It makes me less likely to buy flash of steel, making me more likely to gain block.

I have done some compatability testing with other mods but it's hard to test for every mod, if you do notice problems/crashes let me know and I can fix it, I'm a coding addict so I'll get on it quick-ish

Thank you for the feedback, these are all good ideas I'll look into

Making the game harder is not an act against STS modding. What I wanna know is if there's an option to just start with the key. I just use the "Always Never Keys" mod to skip on key hunting because I cannot be bothered.

Since, currently, the command to just add the key isn't working, how about an option for the mod to just start with it?

Also, is this compatible with not just Downfall, but how about Pale of the Ancients mod? How about the Library of Ruina mod's fourth act? What will get me to thumbs down your mod is if it crashes my game more than... a few times.... Listen play with over 30 mods, so I don't have problems with things crashing as long as it works and I can play around it crashing and and I'm having fun.

is this compatible with downfall? im meaning giving the elite fight 4 minions instead of 3, giving neow a 4th buff thingy, giving a purple heart relic upon obtaining the purple key and breaking it etc. it would be so cool if that is do-able

I gave it a go and yeah it's quite well made. only wish the amathyst key gold cost was affected by membership card and had a description when you mouse over it but otherwise 10 out of 10 mod.

In act 4 the spear and shield will have burning elite modifiers, the heart will have more health, a higher heartbeat effect, lowered invincibility and a burning elite modifier I guess in essence it's not really harder but just requires a more consistent deck

Make sure that the key isn't expensive in the store. This game is already coin-starved.

What does " increases the difficulty of the final act." means concretely?

I know the watcher was added later, but I always thought it was weird that she never had her own key like the others.