Tower defence or TD games are strategic games. The goal is to keep enemies from crossing the field by building towers and shooting at them. When the enemy is defeated the player earns points or money which can be used to build new towers or upgrade the existing ones.
Tower defence games online
Tower defence games are cool Real Time Strategy (RTS) games. Try to defend a railway, castle, desert, sea, river, or temple. Beware of enemies crossing the map or the path in your field. Try to hit them and built new towers. Don't let them get through!