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UIFO Defense has a special gameplay of tower defense. Your base is exposed to dangerous alien destroyer, they send an army to grab your energy crystal cores which are critical to science and technology of your civilization. Utilize the terrain and different turrets to eliminate enemies and protect your base.

Key Features:

Protect the energy cores: You have 15 energy cores in every base. It's top priority to defend the cores not to be grabbed by alien invaders.

Eliminate alien invaders: Try best to build most proper defense turrets to make maximum damage on different types of alien creatures and mechs.

Energy resource: Consume energy resource to build your defense line, and recover energy resource by gathering energy from dead alien invaders.

Flexible difficulty: Recommend you play in hard mode difficulty to enjoy the fun of exciting strategical battle. However, you can easily switch to normal mode difficulty in any level in case you have obstruction in hard mode.