Today I read a thread at the German Blender forum. There was a question how to build a tower out of blocks that gets not destroyed after starting the GE. (The blocks where jumping around)
With that it came into my mind:
How much stones can you put on top of the other without the physics to destroy the whole thing?
So I build up a small blend file that dynamically adds stones. One at each frame.
The stones are 1x1x1 Blenderunits with a radius of 0.5.
It seems such a tower can be up to around 35 stones with bounding type cube. After that it goes very instable.
Surprisingly the tower is really stable when using bounding type sphere.
For some fun I added an earthquake. It can be activated with <space>.
I would like to know if someone can modify the blend in a way, that you can put (lets say) 100 stones on top of each other and the tower is still stable and responsive to physics.
You can increase the number of stones by increasing the “to:” field of the emitters IPO actuator.
What high is you tower?
John316s method 500+
(Please keep in mind: This is just fun)
Monster
Attachments
tower builder.blend (140 KB)
Without changing the cubes physics settings! I did change the world physics settings though. Is this cheating? 
If you set the cubes form factor to 0.5 or higher you can get over 500 blocks high.