Free Online Games

Substitute is an exciting Action Game and published on Jan 6th, 2012 and has been played 32 times and has a rating of 0% after 0 votes.

Similar to tower defense games, you must buy turrets and other weapons to protect your city from the sub-virus. You all also control a gun with horizontal movement, which you can upgrade with the money you earn from killing enemies. Spend your time searching for an anti-virus, upgrading equipment, looking for survivors or training soldiers when the enemies retreat.