Want some more Sentinel goodness while you’re waiting for the release of Sentinel 4: Dark Star? The Sentinel 3 Campaign 2 expansion pack is now on sale for a limited time! Get 15 brand new maps along with towers, ship weapons and dastardly new aliens for just $0.99. Campaign 2 is an in-app purchase, so load up the game and visit the store.

Plus, if you can beat Campaign 2 level “The Pit” on Psycho, come to the forum to brag. This map’s proven the ultimate Sentinel challenge to date!