Blender GE and Others

Hi everyone. I’ve used Blender for about a year now but have only recently started with the game engine. I would just like to know what crystal and ogre3d are for? Should a game in blender use crystal/ogre3d, or what?

crystal space is a different rendering engine, and so is ogre. We are still working on implementing Ogre, but CS is up I think. You can use CS with CEL Which allows you to make games using blender as only the level editor. I’m not an expert, but thats all I know.