Are there any great tower defence games for pc that are not plants vs z, or online games..?

i dont watnt online games. i already have p vs z.Are there any great tower defence games for pc that are not plants vs z, or online games..?
ERASED

Sorry, read it wrong. More tower defense games are online because they're simple and flash-based.

Try Warzone: Tower Defense
Master of Defense
Defense Grid: The Awakening

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Kasey C, PC guru since Apple II days
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