Natural Selection 2 is the sequel to the popular Half-life mod, Natural Selection, which was the most popular independent Half-life mod and was played by over 300,000 players for over 2 billion player-minutes. Natural Selection 2 is a online-only first-person shooter and real-time strategy hybrid. Players can play as marines, aliens or commanders and fight in atmospheric sci-fi environments.

Features:
• Truly unique sides. Whether you play as one of the elite marine Frontiersmen or the vicious alien Kharaa, you must use unique strategies and your abilities to win. Marines form persistent squads to find and destroy alien hives. Aliens can choose a wall-running Skulk, pudgy Gorge, flying Lerk, murderous Fade or gigantic Onos that can smash through doors.

• Real-time strategy. Commanders play from overhead to lead their team to victory. Build structures anywhere, collect resources and research upgrades. Marines buy weapons at an Armory or build sentry turrets and siege cannons to assault the enemy. Aliens build chambers, evolve special abilities and plant traps.

• Dynamic environments. Spreading alien infestation deforms hallways and causes space station power failure, turning off lights and shutting down marine powered structures. Use a flamethrower to clear infestation or weld a bulkhead shut for a last defense. Every game is different.