If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your mission in this online zombie game is to control the last platoon of soldiers on earth and save humanity from the zombie hordes. Kill all the zombies in each sector to clear that level and move onto the next. Take control of your soldiers and use them to destroy the zombies and build defenses. Use your commanders gun to protect your base. Once the base is destroyed it's game over. Use the upgrades to kill more zombies. You start each level with 3 soldiers. A Machine gunner, a Hand grenadier and an engineer. Each solider type has different abilities.