Editor / Construction Set: Denotes the addition of an editor bundled with the game so as to facilitate tweaking game variables, drawing new playfields/maps, drawing new graphics, etc. Built-in editors greatly extend the life of games because they extend playability infinitely. Games that are exclusively built around this concept are called "Construction Set" games; ie. "Pinball Construction Set" or "Adventure Construction Set". Part of the Other Attributes category.
You can browse through games in the MobyGames database that are part of this genre via the game browser.