with game editor, you can't really make a 3-d moving game, but you can make a 3-d game. one simple way to do it is put a 3-d video as a back and have enemies that start small and grow to look like they're comming at you. this would make a good 3-d shooter, you just can't turn left and right.
another good way, which I made a quick demo for is to make it so your char doesn't have a physical responce with the ground, but with a filled region. you put the filled region somewhere in the middle of the floor.
the demo I posted isn't high detail, you may find a few glitches with it, it is just meant as an example.