Kingdom Rush

A long long time ago, in a kingdom that is very far that  no one had heard of.  There was a story of braveness, wherein several men stand up against the orkish troops.  It happened a long time ago.  When the orkish troops start invading, the king had called several brave men to fight for the kingdom.   The game is played via mouse and the idea here is to build some towers to defend the kingdom.   Each monster kill would earn you money.  You can use the money to buy more towers or upgrade the existing towers.  Each tower has its weakness and strength.