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Quests are one of the characteristic features of computer role-playing games (further simply RPGs in this article, as the nature of tabletop RPGs is very different). By definition, an RPG relies on them to develop the plot and keep the player entertained.

A distinction is usually made between the main quest, whose completion traditionally marks the end of the game, and side quests, which are generally optional and are done for rewards.

The structure of a quest

A quest can be defined as a series of actions that have to be taken to reach an ultimate goal. To be complete and to have sense, a quest must have several basic elements:

Target

What your character is supposed to change in the game world. The most typical example is a fetch quest, in which the player must acquire some item and bring it back.

Chain of prerequisites

What must be done to achieve the quest target. A simple beginners' quest might have no such chain of prerequisites, but to complicate things for the player, most quests have some chain of requirements. For example, on a quest to retrieve a dragon tooth (the target), the player must first level up to some point, accumulate good equipment, find the golden key (a quest item) to get the whistle of sound sleep (another quest item), ask a hermit for directions and only then actually fight the dragon.

Reward

Players won't do quests for nothing, but expect to get some benefits in return, for example an artefact item with special properties or some perk unattainable by conventional means. An exception may be the main quest, which simply ends the game and as such can't supply any other reward than a credits screen.

Decorum

Everything else that exists only to create the atmosphere – why the quest giver wants you to do the job for them, the way they speak, the style of the quest items, and so on.

The terms used above are in no way standardised or universal, but were defined for the needs of this article.

Quests in roguelikes

Due to the complexity of interesting and involving quests, the main quest is almost always static. However, lesser side quests which aren't so developed are more feasibly generated by an algorithm.

HTML and CSS

The standard method for user interaction is via HTML, CSS and its Document Object Model (DOM). Thanks to this, JavaScript supplies perhaps one of the most portable APIs for development. In the current state of things, there are actually several environments for visual presentation and interaction within a modern web browser:

HTML, CSS and the DOM (Document Object Model)

The oldest presentational API, which is also known collectively with JavaScript as DHTML, for Dynamic HTML. It involves using pre-defined HTML elements and changing their style to create a dynamically-changing web page. Traditional DHTML is only of utility to very simple games, since it is not possible to escape the limits of presentational HTML markup – it is not possible to draw free shapes without going to extreme lengths to do so.

Canvas 2D context

A standard that first appeared in 2004, and is currently supported by all popular modern web browsers (with Internet Explorer being an exception up to version 9). Canvas 2D in itself is a rather simple 2D API with a set of basic functions for drawing lines, arcs, curves and polygons. It also has the useful ability of

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