Hungary annexes Austria, Czechoslovakia, and Transylvania and is able to reform Austria-Hungary. This is done through the game's Focus Tree, all I did was change a small chance for it to happen to a 100% chance for it to happen. Take the "Balanced Budget" path (all the way to the left side) down the Focus Tree, through the "Demand a Referendum", "Protect Czechoslovakia", and "Claim Transylvania" all 3 will be annexed. Once that is done, if you also complete the "March to the Shore" focus to gain a claim on Yugoslavia, and then switch to the Military path (all the way to the right starting with "Secret Rearmament") down to the "Bled Agreement" France and Romania will allow you to re-arm. But Yugoslavia will get mad and declare war on you. You will have Austria's and Czechoslovakia's forces so should be able to beat Yugoslavia. There is also a 2nd main file that includes annexing those 3 but you can also annex 3 states from Poland, but since that wasn't possible on the DOD focus tree I decided to post 2 separate files: one annexing Austria, Czechoslovakia, and Transylvania, the other annexing Austria, Czechoslovakia, Transylvania and 3 states from Poland. To annex the Polish states complete the "Claim Galicia" focus.