Origin8 takes the iPhone TD battle to the alien homeworld in Sentinel 3
Blast them from above
It seems to be the right time for the next wave of tower defence games.
We've had Chillingo/Cobra's iBomber Defense, Glu's Lord of the Rings: Middle-Earth Defense, and now Origin8 has released the third in its sic-fi themed Sentinel series.
The biggest instalment to-date, Sentinel 3: Homeworld has you fighting on the aliens' front step, down the garden path and into his back bedroom, with the action set across 20 levels and 14 distinctive maps.
At your disposal are over 20 unlockable turrets, automated drones and your orbital ship's weapons, plus a new commander unit which levels up and gains new abilities as you play.
You can also customise your weapon loadout in the armory before each mission.
Fight them on the winding roads
As well as the main Classic mode, and each map is available in an Endless option.
OpenFeint and Game Center are used for achievements and leaderboards. Neatly, OpenFeint is also used to view other players' strategic layouts - selected via the leaderboards so you can see how the best generals fight.
Sentinel 3: Homeworld is out now for iPhone and iPod touch, priced $3.99, €2.99 or £2.39.
You can see how it plays in the following video.
