Modding can be accomplished with simple tools and basic knowledge of scripting. Paradox tries to make games that are open and easy to edit (moddable), from tweaking a saved game to creating an entirely new scenario. The games are mostly based on an open game engine sandbox-style game with no set 'victory' condition. Later patches may contain large changes to the game and the way the game is played, in response to the demands and requests of fans. Some games have required patches shortly after release to make them playable. Paradox regularly releases patches to their games long after a game's initial release. Paradox Interactive games are also characteristically complex, with highly detailed gameplay models and consequently steep learning curves. The focus of each game is different, but generally a player must manage the economy, commerce, internal politics, diplomacy, technological development, and military forces of a nation. Almost all Paradox games have historical settings and demonstrate a reasonable commitment to historical accuracy. The studio produces what it terms 'Grand Strategy games', meaning ones played on a real-world map, marked by the use of standard real-time elements but with an ability to make any and all changes while paused (and while unpaused).

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