To explain what Xav and myself were talking about earlier; in Engineering terms, 2.XD refers to the axes of motion of a machine/robot. Imagine a robot that could move back and forth and stop at any point; that would have one degree of freedom. A robot that could move back/forth and left/right and could stop at any x,y point within its workspace would be 2D.
Now, imagine that last robot with a tool that can move up and down, but can only stop in either the fully raised or fully lowered position. This would be considered 2.2D; 2 degrees of freedom + 2 possible positions in the third dimension.
2.5D would imply that the tool could move up and down and stop in five specific locations. That happens too, but is not very common.
In any case, this is all splitting hairs. Just wanted to point out that the phrase has different meaning in different contexts.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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