Overview
Like all games, wargames exist in a range of different complexities. Some are fundamentally simple—often called "beer-and-pretzel" games—whereas others attempt to simulate a high level of historical realism. These latter games may produce long rulebooks that encompass a large variety of actions and details. These games often require a considerable study of the rules before they can be played. Wargames also feature a range of scales, from games that simulate individual soldiers, to ones that chart the course of an entire global or even galactic war.
Wargames are generally a representational art form. Usually, this is of a fairly concrete historical subject (such as the Battle of Gettysburg, one of several popular topics in the genre), but it can also be extended to non-historical ones as well. The Cold War provided fuel for many games that attempted to show what a non-nuclear (or, in a very few cases, nuclear) World War III would be like, moving from a re-creation to a predictive model in the process. Fantasy and science fiction subjects are sometimes not considered wargames because there is nothing in the real world to model, however, conflict in a self-consistent fictional world lends itself to exactly the same types of games and game designs as does military history.
Because of these attitudes, there are many games and types of games that may appear to be a wargame at first glance, but are not accepted as such by members of the hobby, and many that would be considered debatable. Risk could be considered a wargame; it uses an area map of the Earth and is unabashedly about sending out armies to conquer the world. However, it has no readily-discernible timeframe, and combat is extremely abstract, leading many to not consider it as an actual wargame, or only tangentially as one.
The highest percentage of war-themed games that are not wargames come from the video game industry. Most markedly real-time strategy games (such as StarCraft) deal with combat nearly exclusively, but the gameplay-enhancing conventions of the genre also destroy realism. For example, in actual combat, vehicle armor is generally a binary proposition. Either the round penetrates and the vehicle is knocked out, or it does not and the vehicle is unaffected. RTS games make a habit of giving a vehicle a "health bar" that generally allows it to survive even powerful single shots, but each hit reduces its health by some amount, allowing a high volume of rifle fire to knock out a well armored tank. Other notable genre conventions include the construction of buildings and vehicles within the timeframe of a battle (i.e., hours, if not less) and a lack of any command and control, supply, or morale systems.
A major determinant of the complexity and size of a wargame is how realistic it is intended to be. Some games constitute a serious study of the subject at hand, whereas others are intended to be light entertainment. In general, a more serious study will have longer, more detailed rules, more complexity, and more record keeping. More casual games may only bear a passing resemblance to the subject, although many still try to encourage the same types of decision making as the player's historical counterparts, and thereby bring forth the "feel" of the conflict.
Wargames tend to have a few fundamental problems. Notably, both player knowledge, and player action are much less limited than what would be available to the player's real-life counterparts. Some games have rules for command and control and fog of war, using various methods. While results vary, many of these mechanisms can be cumbersome and onerous in traditional games. The "edge of world problem" raises the issue of what to do at the artificial boundary of the physical edge of a board game, in contrast to real life where there is no "edge" and units off-board can have a tangible effect on a scenario. Computer wargames can more easily incorporate these features because the computer can conceal information from players and act as an impartial judge (even while playing one side). However, due to interface issues, these can still be found to be as frustrating to the player as traditional methods.
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