There are many different free tower defense games. Flash Element Tower Defense and Desktop Tower Defense are two of the first, and are still quite popular. Desktop TD particularly is recommended by multiple bloggers and received a Gleemie award; it was played more than 15 million times in the first 5 months of its release.
Cursed Treasure TD No ordinary tower defense: these creeps are thieves! Protect your precious with powerful towers, spells and more! this is a pretty fun game that is mainly like monkey tower defense
There is one that is an alpha game, but is very fun. It is simply called pokemon tower defense which is on newgrounds site.
go on pregamehacks.com have fun
GemCraft is a tower defense game that allows a user a strong sense of strategy and RPG gameplay. The game is quite fun and many find it highly addictive.
Try a game called Bloons Tower Defense 5. There is no need to download it, and there are many other games on the website. However, you need to make an account (Free of course) to continue in games and save high scores and stuff like that.
Viking defense is a tower defence-style action game, sort of a shoot 'em up game, that you defense against battalions of birds and whales from going into your harbour. It is said to be runes the little arrows that are thrown from your catapults and defense towers. There are 5 levels and to manage each level you need to set up fortification at predetermined location, as well as buy the right gears. If you like tower defence genres, you will probably be addicted to this game. But after all 5 levels completed you quickly find it boring.
Well Habbo is free and fun online game were you can meet new and fun people!
the biggest game is WARROCK and its free and fun its a mmorpg
My Free Zoo is a good and fun game!
Mara Pets is the best game ever! Free, fun, and no download!!! On mara pets their are MANY quests that are fun and rewarding!!!
Free realms. Is very fun and it's free
Morphting.com is fun and absolutely FREE!!