Tower Defense games are a popular type of real-time strategy games. The aim of Tower Defense games is to prevent enemy units from reaching the end of a predefined path.
The Tower Defense games will require you to place towers or other units at points along, or surrounding, the path in order to try and prevent the enemies from reaching the end.
Most Tower Defense games will allow you to upgrade these towers and units to make them stronger or provide further range.
The key to winning a Tower Defense game is to position your towers in such a way to maximise their effectiveness and to choose the best towers for the intended purpose.
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