i think the best idea is just going based on the game! For example when u up grade your wall it goes from fire to electric! The townhall should upgrade from lava to electric! It should be blue the match walls and be able to get one more X-bow, air bomb, air seeker, skeleton trap, giant bomb, archer tower, gold producer, elixir producer, dark elixir producer, and 2 more bombs, spring traps and 25 more walls!


