Origin8 is making their fan-favourite sci-fi Tower Defense game "Sentinel 2: Earth Defense" for free on Friday 7th May, in association with OpenFeint's Free Game of the Day program. Get it now before the promotion ends!

Sentinel 2: Earth Defense features:

- Specialised structures and units provide unique tactical gameplay.
- Use the landscape and destructible defenses to maximize the effectiveness of your weapons.
- Unleash the Sentinel's incredible ship weapons system - if you've got the power to do so...
- Resource harvesting and interest system adds a new dimension of risk and reward.
- Deploy mobile attack drones to harass the enemy and augment static defenses.
- Assault mode provides hours of play; endurance mode is an endless challenge.
- Mission mode provides quick tactical challenges. Beat a scenario to earn achievements!
- Visually stunning environments, towers and enemies with fluid zooming and scrolling.
- Full online high scores, achievements, friends and chat using OpenFeint.

Players hankering for even more action can purchase Sentinel 2's Expansion Pack One in-app for $0.99 or regional equivalent. This pack provides two new maps with unique tactical challenges, a new enemy, three new missions and associated OpenFeint achievements. The classic Sentinel: Mars Defense is available on the App Store for $1.99, and players can follow the Sentinel a century into the future in acclaimed strategy game Space Station: Frontier ($2.99/$4.99 iPad HD)

Sentinel 2: Earth Defense is available from the iTunes App Store here: http://itunes.apple.com/app/sentinel-2-earth-defense/id320388936?mt=8

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