A new Tower Defense Map Pack for Oil Rush is now available as the first DLC for this naval strategy game. The pack is available on the Unigine Online Store and Steam, and word is it offers "a completely new tower defense game experience, including a tower defense co-op mode. Exploit new strategies with completely new technology tree, assault and defense units." Here's a feature list:

• 5 challenging Tower Defense maps with relentless waves of furious enemies
• A completely new game experience – Tower Defense multiplayer co-op for up to 3 players
• Brand new Technology tree makes completely new strategies possible
• New unit: Raider’s Catamaran – great for fast hit-and-run strikes
• New tower: Heavy Mortar Turret – the ultimate in naval defense