What is a two_and_a_half dimension game?

Question

I have been told that when the game is basically a side-scrolling game with 3D elements in the background/environment, it becomes a 2.5D game. Is there any correct explanation for this term?

Answer

Games are said to be in 2 dimensions, when you can only move in the X and Y axis (ie. left, right, up and down or similar).

3 dimensional games let you move in more more axis (usually the Z axis).

A 2.5 dimensional game is a game that works much like a 2 dimensional game, but usually allows you some limited control of the third (Z) axis. An example of this would be Little Big Planet, where you usually justmove in the X and Y axis, but can step "into" the Z axis in a limited fashion (I think there are like 3 "planes", front, middle, back). There are also some fighting games that allow this.

This is not to be confused with gamle that are donw with 2d or 3d graphics.

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