I avoid using any of the measurement options in Blender and stick with the standard Blender units. A grid square in GameGuru is 100x100 Blender units, one unit in GameGuru is 1 blender unit, a character is around 80 to 85 units tall, so a doorway would be around 90 units tall, and 45 units wide, and a wall would be 100 to 110 units high.
If you want to use meters in Blender, then i think (and i might be wrong) you have to scale by 100 (don't forget to use shift+a to set your scaling otherwise it won't stick in GameGuru).
[img]belidos3d.swgrp.co.uk/wp-content/uploads/2016/03/blogo.png[/img]
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