A tower defence game that's also a bit based on luck. Place 5 gems each round, you can only keep one. Upgrade the chance to find better gems and upgrade or combine your gems to get better. Original...

A large tower and turret defense game. Build and upgrade towers and train units to fight the incoming enemies.

Choose wisely amongst the fifteen tower types, upgrade them, combine them, find the most effective placement combination, and earn as much as you can. Azgard Defence is an awesome tower defense gam...

Prevent aquatic life from entering your water station by building towers. Click on fishes to attack them. As you progress through the levels, more towers will be unlocked. (sorry for the lousy image)

A 50 Kb tower defense game, buy different turrets and upgrade them with elements like Lightning, Fire or Ice, or give them power upgrades. All very basic and not that challenging.

An amusing tower defense game with the same theme as Master of Security, defend your computer from viruses. Find your favorite towers and their upgrades.