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There's 40 basic levels to complete and 4 endless levels to test how long you can survive.
There is four different towers with different effects.
Blue: pierces and slows
Red: explodes and does splash damage
Green: creates poison clouds
Purple: slows and weakens
Every tower can be upgraded five times to boost their range and damage and effects.
Game is really easy to learn and thus is a good way for beginners to learn to enjoy strategic tower defense games, but has the depth to provide a challenge to even the most seasoned tower defense veterans.