11 Bit Studios' Anomaly Warzone Earth will be available to US PlayStation Plus subscribers at no extra cost from tomorrow, December 18.
The real-time strategy/tower defense hybrid will be added to the US 'Instant Game Collection' as part of tomorrow's US PS Store update.
Anomaly Warzone Earth was originally a PC/Mac game released in April 2011. Since then it has been released on iOS and Android devices, Xbox Live Arcade and, in September 2012, the US PS Store for PS3 (August in EU).
According to Sony's description, "The game tasks you with saving a near-future Earth from an alien onslaught. The invaders have captured world's major cities, building huge turrets that destroy everything in their path. It's up to you to lead an armor squad through the streets of cities like Baghdad and Tokyo, planning the route and strategically choosing which units to deploy in order to crush the opposition."
Here's a look back at the game's PSN launch trailer.