Door

Doors are a commonly found in games across a wide variety of genres. In addition to providing verisimilitude (after all, the real world contains a lot of doors), they serve a variety of mechanical functions:


 * Restricting the player's access to different areas, via any of several mechanisms:
 * Requiring the player to find a key
 * Requiring the player to access a switch, computer terminal, etc. located elsewhere
 * The player may also have the option to pick the lock
 * Doors may also become open/closed or locked/unlocked as required by the plot
 * Blocking line of sight and propagation of sound (soft cover)
 * Blocking fire (hard cover)
 * Limiting the player's avenues of approach to a situation

The player can sometimes use doors tactically - e.g., by using them as choke points so that large groups of enemies can be engaged one at a time.

Passing through some doors may load a new area.

A door doesn't have to be a literal door - it could be a window, a portal, a drawbridge, or any other which has both passable and impassible states.