The year is 2108 and Earth is under attack from a race called the Vectoids. The only way humans can survive is to strengthen its defensive capabilities using Vector TD, a computer simulation of Vectoid attack scenarios. Deploy and upgrade towers to zap foes as they walk by, preventing them from reaching the end point(s) on each map. Earn cash by defeating foes and keep your defenses strong to stave off the increasingly powerful hordes. Best Vector TD 2 games.