I think you're confused. There are only three spacial dimensions. And I think he meant 3d Real Time Strategy games in particular. There are ones with 3d graphics but you're still technically restricted to two degrees of motion in that the height dimension is only utilised for hills and valleys - not true freedom.
So I don't know what you mean by a fully 3d game. The only possibility would be one set in space. The problem with that would be how to clearly represent that on a 2d screen.
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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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