Gameplay
See also: Miniature wargamingGames are held between two or more players, each of whom fields a group of units they have purchased, assembled and painted. Painting is not always necessary in a friendly game, but it does add to the quality. The size and composition of these groups, referred to as armies, are determined on a point system, with each unit (figurine) assigned a value in points roughly proportional to its worth on the battlefield (a better unit or model is worth more points). Before a game, the gamers agree on how many points will be used as the maximum army size and each assembles an army up to that maximum limit. The composition of these armies is usually constrained by rules contained within the Warhammer 40,000 rulebook, as well as in several army-specific rulebooks called 'codexes'. These rules and preparations are generally taken seriously among players. Common game sizes are between 500 and 2,000 points and played on tables four feet in width and four to eight feet in length, but it is possible to play much larger games.
At the onset of each game, a set of rules and goals is determined for that battle. These are collectively referred to as the scenario or mission being played. Players are assigned basic goals which range from the defense or capture of sections of the board to the destruction of enemy units. Additional rules may represent conditions for fighting at night or in environments that affect troops' abilities. These scenarios may be straightforward, taking only an hour or so to complete, or they may be quite complex and require several hours or even days to complete. A series of scenarios may be organized into a campaign, where two or more players fight against each other in a number of battles. These campaigns may feature their own special rules, and are typically tied together by a storyline that can evolve based on the results of each scenario. Many scenarios and campaigns are designed by Games Workshop and printed in the 'codexes', rulebooks or White Dwarf. Alternatively, gamers may design their own scenarios or build new campaigns from premade scenarios.
Play is divided into "phases" where each player moves, shoots, and/or engages in close combat with various units. In the Movement phase, a player determines the direction and distance individual units will travel, unless a special rule states otherwise. Some units can travel further than others in a single move, and terrain may inhibit movement. In the Shooting phase, the player has the opportunity to make long-distance attacks with units that are within range of the enemy. In the Assault phase, units may engage in close-quarters fighting with nearby enemy units. After one player completes all three phases play is turned over to the opposing player. Contingent events such as weapon hits and misses are determined by the roll of a six sided die (note that the rulebooks use the word "dice" to refer to a single die) and unit characteristics. A specialty die called a scatter dice is used to determine deviation for less accurate events such as artillery barrages or reserve units deploying onto the battlefield through irregular means. Unlike some wargames, Warhammer 40,000 is not played on a hex map or any kind of pre-defined gameboard. Instead, units can be placed from 12 inches from the edge to the edge of the table. Range between and among units is important in all three phases of play. Distance is measured in inches using a ruler. Determination of line of sight, is made at "model's eye view"—gamers may bend down to observe the board from the specific model's point of view. Victory is determined by points, awarded for completing objectives and/or destroying enemy units.
Benjamin Fox, in "The Performance of War Games", argues that player interaction on the battlefield reflects all portions of a "performance": script, drama and theater. He compares war games like Warhammer Fantasy Battle and Warhammer 40,000 to role playing games such as Dungeons & Dragons and notes the dynamic nature of battles, where each conflict is different from the last.
Terrain is also an important part of play. Although Games Workshop sells terrain kits, many hobbyists prefer to make their own elaborate and unique set pieces. Common household items like soft drink cans, coffee cups, styrofoam packing material, and pill bottles can be transformed into ruined cathedrals, alien habitats, or other terrain with the addition of plastic cards, putty, and a bit of patience, skill and imagination.
There is also the possibility to play Warhammer 40k by Internet through the Java-based VASSAL Engine for which a Warhammer 40k Module has been released. This is a simulation of the board game and can only be played against other players. After the release of the 5.2 version of the module Games Workshop demanded that the lead developer cease development of the module. The module is still played by several hundred players and a new team announced further updates.
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