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Ragnarok: 1940

Welcome to Ragnarok 1940, major changes include pushing the war start year 1 year back, allowing the puppeting of Hungary and Romania and Germany won't trigger the end of the world mid-civil war because that event checks if Germany is not mid-civil war.
Original mod link and description:
https://steamcommunity.com/sharedfiles/filedetails/?id=728048911
TL;DR Germany vs the World. Build up your army quick.
Also available: Ragnarok: 1937

Enjoy playing as Germany, but finding the difficulty lacking? Looking for a more even contest? Then Ragnarok might be just what you're looking for.

Some mods aim to increase difficulty by trying to make the AI smarter or giving it large bonuses, others by slapping the player with harsh penalties. Ragnarok takes a different approach. By making a few subtle diplomatic adjustments, the German player should get the challenge they've been craving.

You might want to man your borders.
ALL your borders.

IMPORTANT INFORMATION
Intended only for the 1936 scenario, whilst playing as the German Reich.

Recommended settings
Difficulty: for the 1937 scenario, Recruit is a good idea, at least for your first playthrough; for the 1939 scenario, Regular difficulty is recommended
Ironman Mode - disabled: ironman deactivates the console, which can come in handy if you encounter any issues.
Historical AI Focuses - enabled: reduces the chance of inadvertently starting the world war early.
Ragnarok: 1937 is harder than the 1939 scenario, and has some extra options available for tailoring difficulty.

You have one year (Ragnarok: 1937) or three years (Ragnarok: 1939) to prepare, use them wisely.

Getting into a war with anyone starts the world war prematurely.
(Ragnarok: 1937 only - 'First Vienna Award' and 'First Ljubljana Award' are off limits. Beginning work on either of these national focuses will also trigger an early world war.)

In battles, the amount of combat width available has been expanded significantly: base 231 (previously 80), plus 83 (previously 40) per additional attacking province.

For a WWII simulator, HoI4 is quite slow when it comes to getting a proper world war started. As each successive country joins the Allies, it takes more and more CPU time, probably due to the need to grant all the other members of the alliance military access. Hence the the start of the war is handled via a multi-stage event, with more countries joining each time. In all, it can take a minute or more of CPU time to finish. This process only has to be completed once though, and after that it doesn't seem to have any effect on save and load times.
Additionally, it's best not to create Vichy France or to stage coups, as the job of creating a new country will take another minute or so of CPU time.

TIPS & SUGGESTIONS
It's best to spend the first few minutes of the game deciding on one's long-term strategy. Where will you attack first, where are you going to defend, and what will you abandon? Pay close attention to terrain and rivers, as defending in open plains will prove difficult.

Aside from the 'Treaty with the USSR', you probably don't want to be wasting time with national focuses that befriend other countries. Only puppets will remain loyal after the outbreak of war.

It's probably a good idea to save up some political power for when the war starts, lest you get stuck on undesirable trade/mobilization laws.

OTHER MODS & COMPATIBILITY
Most mods should work with Ragnarok. My philosophy when creating this mod was to avoid making alterations to the base game and instead use events. Mods that change tech names or replace national focus trees for European countries might still cause issues, however, since events in Ragnarok refer to specific ones.

Mods like Expert AI or no a.i. unit spam are available if you are unhappy with the quality or quantity of units produced by the AI in base HoI4.