Create Dynamic Architectural Models With the Array Modifier
DennisH2010 shares an interesting application of Blender’s array modifier: he has created an ‘array house’ where you can dynamically change the number of floors.
DennisH2010 writs:Here is a array house example with start and end cap. You can add more floors by increase the count in the array modifiers.
—BUG WARNING— Unfortunately you have to apply all the array modifiers bevor you start the blender game engine, otherwise Blender will crash.
Link


But Andrew Price did this long time ago…
In the game engine?
So I probably did not understand something, is he adding floors while running the game or before running the game?