It's always nice when people respond to what you've written, but this comment really brought back a surge of memories for me! Do you also recall, around the sam

It's always nice when people respond to what you've written, but this comment really brought back a surge of memories for me! Do you also recall, around the same era, there was a precursor to Angry Birds called "Crush the Castle" that similarly spawned obsessive level creation. With DTD it was A* pathfinding. With Castles it was 2D physics. Simple engine mechanics engenders repeat playability ;)