The game provides a fairly clean interface which is easily navigable. Hol4 has a similar user interface as the previous titles from the Hearts of Iron series with just a few minor and major changes. Hol4 lets you choose the greatest commanders of the WW2 era to fight your war with the tools of the time tanks, planes, ships, guns and newly discovered weapons of mass destruction. Here are some of the major features and key points of the game which make it even more interesting. Paradox Interactive, the developers of the game have done an incredibly exceptional job in thickening the plot of the game. The game is extremely complicated and it gets more and more interesting as you keep playing it. However, Hearts of Iron IV which is based on the simulation of the period during the second world war contrasts other simulation games in a number of ways. Simulation games are trending these days and Hol4 is one of them, but the funny part is a lot of simulation games are boring or no fun to play at all. No matter how terrific wars are, it is always interesting to learn about them. World War II was terrifying, petrifying and horrific. The game was released on June 6, The game mostly focuses on the period during the second world war. The game has been developed by Paradox Interactive.