Dimensions
From Styleguide
dimensions
A game with two-dimensional gameplay is one in which movement is limited to two different axes (left-right and up-down, for instance). A three-dimensional game allows movement along three axes.
Graphically, a two-dimensional game typically uses sprites to represent characters, objects and backgrounds, while three-dimensional games generally use polygons.
Note that games with two-dimensional gameplay may have three-dimensional graphics, and vice versa. For instance, New Super Mario Bros. is a two-dimensional game with polygon-based three-dimensional graphics, while Super Mario RPG uses two-dimensional sprites to allow for three-dimensional gameplay.
2D and 3D acceptable after first reference. Do not use 2D or 3D at the start of a sentence.
Example: The Super Nintendo version of Star Fox, which was the first game to use the Super FX chip, represented many gamers’ first experience with three-dimensional graphics in a game.
Wrong: 2.5D, 2-d, 2-D, 2-dimensional, 3-d, 3-D, 3-dimensional, three-D, two-D.
