as 3D Studio Max, Blender, AutoCAD, Lightwave, Maya, Softimage XSI or Grome is used, usually customized with a special plugin developed for the specific game. Level editor A level editor (also known as a map, campaign or scenario editor) is a game development tool used to design levels, maps, campaigns and virtual worlds for a video game. An individual involved with the development of game levels is a level designer or mapper. In some cases, the developer of a video game includes built-in level editing tools; for example, a track editor for a racing game. Other times they may release an official level editor for the game as a separate application. Sometimes players of the game develop fan-made level editors. One of the first 3D games which became popular partially due to level editors and fan-made maps, other game addons, and other works related to the game, was Doom. The development of various third-party editors led to the formation of an online community trading fan-made maps. A level editor is often limited to designing levels for only a certain game engine. Developing a level editor takes a lot of time; it is more time- and cost-efficient to release multiple games using the same engine instead of developing a new engine and level editor for each game. As level editors generally allow for limited game-development work, to make larger changes to a game than simply adding new levels, a software development kit (SDK) is sometimes needed. Construction set In the early years of video-gaming, some games came with a utility called a "construction set". This was similar in many ways to a level editor. Some games used them to make extra levels, whereas others (like the Shoot-'Em-Up Construction Kit) used them as a means to develop a game rather than be a game in itself. Gameplay alteration Maps' design can significantly impact the gameplay. For example, the gameplay may be shifted towards a platformer (by careful placement of platforms) or a puzzle game (by extensive use of buttons, keys, and doors). Some FPS maps may be designed to prevent sniping by not including any long hallways, while other maps may allow for a mix of sniping and closer combat. Gimmick maps are sometimes developed to explore selected features of gameplay, such as sniping or fist fighting. While they are briefly useful to level designers and interesting to experienced players, they are