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HOI4 Dev Diary - Custom Gameplay Rules

Hi everyone! Most of the team is now back after summer so it’s time to spin up the ‘ol diary machine again. Today we are going to be talking about something we have been thinking about adding for a really long time: Custom Gameplay Rules.

First off, let me explain why we are doing this - HOI4 is a game people play in a lot of different ways. Single player, multiplayer, achievement runs, casual relaxing and various other. There is also a big split between people who play “historically” vs people who don’t (it’s around 50/50). A lot of stuff that adds fun and a sense of power in singleplayer are not very balanced for organized competitive multiplayer so organizing these games can be challenging, often including long rulesets and policing by the server host. I personally think a big reason competitive multiplayer isn’t as common (about 6% of MP games are competitive) is because it’s so much harder to set them up when they require reading rulesets, which become fragile when the game itself isn’t enforcing them.
When it comes to single player, players often ask for ways to tailor how they play. For example; some will use console commands to switch nations to set them on certain paths to match their long term plans for the scenario they want to play out etc, but it’s not exactly beginner-friendly, and isn’t possible to do in multiplayer either. So looking at all of these things we decided that we needed to support different rulesets and let players affect how the ai did things in more detail.

So, enter Custom Game Rules. This is a new setting you can do before you start your game, and includes the old buff sliders for majors as well:
main.jpg


It’s possible to store and load presets if you have a couple of prefered profiles you run (say single player and multiplayer?). We have tried to make rules as moddable as possible although when they directly impact hard-coded gameplay mechanics we need to make sure we have worked them in first. We’ll go over the modding aspects towards the end!

So what kind of stuff can you do? We haven’t fully finalized it all, but let’s go through what we got. I am sure people will have tons of suggestions in the comments too ;)

All diplomatic actions have the possibility for rules. So we can restrict or ease up how things work. This is particularly good when you want to tie focus trees into it. The new British tree has a lot of interaction with releasable nations, so this also lets us manage that from scripts and avoid exploits and weird situations (such as the player going down the ‘empire’ path, and yet releasing every colony they own).

release.jpg


rule.jpg


Covert actions are also included here, so you can for example restrict coups and such only to AI nations (a common rule in our own MP sessions).
covert.jpg


There are also other bits and pieces like being able to limit fort levels constructable, limiting paratroopers and such we are playing around with. Other things rules we see people use a lot are for example limiting war declares before certain dates etc. I expect we will be presenting a full listing of options later when we stream stuff closer to release.

You can also affect how you want the AI to act. Mostly this means it will be preferring certain choices and switching to alternate plans. If you want to tailor-make your game experience this is a great way of ensuring certain (a)historical outcomes being attempted by the AI no matter your settings.
ai_ger.jpg


For most there are options for ideology while some like Manchukuo are more relevant to its situation:
man.jpg


Some settings, like this particular one, are dependent on DLC, so without Waking the Tiger (which comes with that focus tree) the option simply won't be there. Otherwise the whole custom rules system is part of the free update and is for sure something we will be building on in the future.

Rules will generally turn off achievements, but its possible to set it by rule so if we introduce something we feel is ok in both it will still work.

Modding
So, when we started with this we realized we couldn't support every tiny rule some MP groups were using and instead we’ve tried to make it as easy as possible to mod things in. It’s my hope that some cool ruleset mods will be developed specifically for competitive multiplayer and the like in the modding workshop. Very popular options may even see inclusion in the base game in the future, who knows :) I expect some of the big mods will want to include custom rules as well for their players.

Rule definitions look like this:
mod1.jpg


They can then be checked from triggers from say the tech tree, focus tree, events etc and in other places we have added support for triggers. Example:
mod2.jpg


Diplo actions are a little special. They each get two possible triggers. This way you can turn on or off the standard game checks (like checks against world tension from game code) with the _TRIGGER_OVERRIDES_GAME. For your own rule checks you use the _ENABLE_TRIGGER for the specific action and the scope will contain the target nation as well so you can do nation specific rules.
This is what the triggers for Guarantees look like:
Screenshot_1.jpg


That’s it! Tune in next week to find out more about what we are up to with Man the Guns and the 1.6 ‘Ironclad’ update.
 
I think the reason being in multiplayer games, Brazil is a popular choice for a minor nation to play
Indeed, Brazil can spit out several thousand fighters by 1939, which together with French and perhaps Canadian fighter production can help a lot in evening out the fighter numbers with the Axis come 1940. They can also do other things like make tanks. Before WtT they often made marines. All in all it's a very strong minor nation for the Allies to have.
 
This functions will probaly be paylocked... But still looking forward to it

Some settings, like this particular one, are dependent on DLC, so without Waking the Tiger (which comes with that focus tree) the option simply won't be there. Otherwise the whole custom rules system is part of the free update and is for sure something we will be building on in the future.

As stated in the dev diary :)
 
Hi Devs,

What would also be nice, would be to be able to set what different countries are researching. So that you could tell what your AI allied should concentrate on and other too from start.

/Marine
 
I noticed that in one of the pictures, it says "Italy fascist- Historically accurate." This implies that there will be a non historical path released for Italy. Is Italy on of the nations getting a non-historical path?
 
I noticed that in one of the pictures, it says "Italy fascist- Historically accurate." This implies that there will be a non historical path released for Italy. Is Italy on of the nations getting a non-historical path?

My assumption tells me that they will save Italy for later and that Italy's non-historical path refers to pursuing Italy First instead of the historic Pact of Steel. That said, I would love to be pleasantly surprised by a new Italian tree.
 
I noticed that in one of the pictures, it says "Italy fascist- Historically accurate." This implies that there will be a non historical path released for Italy. Is Italy on of the nations getting a non-historical path?
No, Italy won't be getting new focus tree stuff in this update; just the US, UK, and two as-yet-unannounced minors that currently use the generic tree.

It's probably just called "Fascist - Historical" because Italy also has an ahistorical fascist path ("Italy First").
 
@podcat

I know this is a very late reply, but I remembered a current issue with the AI going down ahistorical paths. The AI doesn't currently seem to take timing into account when they go down ahistorical paths. Sometimes nations will just keep going down the army branch or industrial branch. AI Kaiser Germany should be directed to start WWII at a reasonable time and not in something like 1943 and have half of the world sitting around doing nothing for so long. AI Japan should also go down its ahistorical paths at a much quicker rate. Asia is built for things to happen quickly, and when nothing happens, things in Asia become awkward. Basically, Japan should either get go for its civil wars quickly or sign their non aggression pact with China quickly. Basically as I kind of already said, please make sure countries going down their ahistorical paths prioritize the timing of that path.