First post here, just started some tutorials and came across the Ivy add-on and noticed that I can’t see the Ivy in the blender game engine when I press start player.
I can’t find any reference that says you can or can not use it in the game engine.
I believe the Ivy Generator uses curves for the actual geometry, which is not supported by the BGE. To display it in the engine, you should try to convert the ivy object to a mesh first (and maybe run a decimation modifier on it because the polygon count has the potential to be heavy).