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Introduction to Bloons Tower Defense 4
You press the start button and a new game begins. A screen shows several paths waiting for defense. You pick one and plant towers along the route. Balloons march down those tracks in waves.
A row of towers sits below the map. You choose and drop them onto the road. Each pop gives you cash and you swap or upgrade towers in return. The difficulty stays the same across every track.
The expansion pack unlocks fresh maps and tougher waves. You enable it from the game menu. New routes appear for your towers. Each new map pushes your skills further.